Error dump from a Vassal crash that my gaming buddy experienced today whilst we were playing.
The version was VASSAL-3.5.5-ced5666 (a pre-release build)
The key part seems to me to be:
2021-04-03 01:38:30,941 [25868-AWT-EventQueue-0] ERROR VASSAL.tools.ErrorDialog -
java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location
at java.desktop/java.awt.Component.getLocationOnScreen_NoTreeLock(Component.java:2105)
at java.desktop/java.awt.Component.getLocationOnScreen(Component.java:2079)
at java.desktop/javax.swing.JPopupMenu.show(JPopupMenu.java:940)
at VASSAL.build.module.ToolbarMenu.launch(ToolbarMenu.java:91)
at VASSAL.build.module.ToolbarMenu.lambda$new$0(ToolbarMenu.java:84)
2021-04-03 00:12:45,368 [33516-main] INFO VASSAL.launch.StartUp - Starting
2021-04-03 00:12:45,390 [33516-main] INFO VASSAL.launch.StartUp - OS Windows 10 10.0
2021-04-03 00:12:45,391 [33516-main] INFO VASSAL.launch.StartUp - Java version 16
2021-04-03 00:12:45,391 [33516-main] INFO VASSAL.launch.StartUp - VASSAL version 3.5.5-SNAPSHOT-ced5666
2021-04-03 00:12:45,536 [33516-AWT-EventQueue-0] INFO VASSAL.launch.ModuleManager - Manager
2021-04-03 00:13:02,767 [33516-SwingWorker-pool-2-thread-1] INFO VASSAL.launch.AbstractLaunchAction - Loading module file G:\My Drive\Downloads on ASUS RoG Laptop\CCNapoEpic3a41.vmod
2021-04-03 00:13:03,603 [33516-SwingWorker-pool-2-thread-1] INFO VASSAL.tools.io.ProcessLauncher - launching C:\Program Files\VASSAL-3.5.5-SNAPSHOT-ced5666\jre\bin\java -classpath lib\Vengine.jar -Xmx168M -Duser.home=C:\Users\pault -DVASSAL.port=57992 VASSAL.tools.image.tilecache.ZipFileImageTiler G:\My Drive\Downloads on ASUS RoG Laptop\CCNapoEpic3a41.vmod C:\Users\pault\AppData\Roaming\VASSAL\tiles\1d6070c00cef5e7dcb49b4dd88083d598a368437 256 256
2021-04-03 00:13:04,502 [5888-main] INFO VASSAL.tools.image.tilecache.ZipFileImageTiler - Starting
2021-04-03 00:13:04,628 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/1024px-Battle_of_Borodino_1812.jpg
2021-04-03 00:13:05,019 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/Bataille_de_Marengo v2.jpg
2021-04-03 00:13:05,175 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/British Dragoons.jpg
2021-04-03 00:13:05,225 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/CCN Epic ShortCuts.jpg
2021-04-03 00:13:05,445 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/CCN Epic Shortcuts.jpg
2021-04-03 00:13:05,654 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/Epic Sideboard.jpg
2021-04-03 00:13:06,281 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/EpicSpecial.jpg
2021-04-03 00:13:06,561 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/SpecialRules.jpg
2021-04-03 00:13:06,821 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/SpecialRules2.jpg
2021-04-03 00:13:06,947 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/Talavera v2.jpg
2021-04-03 00:13:07,053 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/VictoryBanner.jpg
2021-04-03 00:13:07,326 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/charts_Austrian_1.jpg
2021-04-03 00:13:07,510 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/charts_Austrian_2.jpg
2021-04-03 00:13:07,715 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/charts_British_1.jpg
2021-04-03 00:13:08,559 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/charts_French_1.jpg
2021-04-03 00:13:08,735 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/charts_French_2.jpg
2021-04-03 00:13:08,968 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/charts_Portuguese_1.jpg
2021-04-03 00:13:09,060 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/charts_Prussian_01.jpg
2021-04-03 00:13:09,212 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/charts_Prussian_02.jpg
2021-04-03 00:13:09,388 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/charts_Russian_1.jpg
2021-04-03 00:13:09,587 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/charts_Russian_2.jpg
2021-04-03 00:13:09,785 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/charts_Spanish_1.jpg
2021-04-03 00:13:09,933 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/charts_Terrain.jpg
2021-04-03 00:13:10,155 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/charts_Terrain2.jpg
2021-04-03 00:13:10,326 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/courier rack.jpg
2021-04-03 00:13:10,355 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/dicefootprint_big.png
2021-04-03 00:13:10,374 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/map_epic.jpg
2021-04-03 00:13:11,347 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/map_lgm.jpg
2021-04-03 00:13:12,606 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/night_chart1.png
2021-04-03 00:13:12,616 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/night_chart2.png
2021-04-03 00:13:12,625 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/night_chart3.png
2021-04-03 00:13:12,636 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/night_chart4.png
2021-04-03 00:13:12,646 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/night_chart5.png
2021-04-03 00:13:12,657 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/night_chart6.png
2021-04-03 00:13:12,666 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/scouts.jpg
2021-04-03 00:13:12,747 [5888-main] INFO VASSAL.tools.image.tilecache.FileArchiveImageTiler - Tiling images/splashepic.jpg
2021-04-03 00:13:12,782 [5888-main] INFO VASSAL.tools.image.tilecache.ZipFileImageTiler - Exiting
2021-04-03 00:13:12,831 [33516-SwingWorker-pool-2-thread-1] INFO VASSAL.launch.AbstractLaunchAction - Loading module Commands & Colors Epic Napoleonics
2021-04-03 00:13:12,835 [33516-SwingWorker-pool-2-thread-1] INFO VASSAL.tools.io.ProcessLauncher - launching C:\Program Files\VASSAL-3.5.5-SNAPSHOT-ced5666\jre\bin\java -Xms512M -Xmx512M -Duser.home=C:\Users\pault -Duser.dir=C:\Program Files\VASSAL-3.5.5-SNAPSHOT-ced5666 -cp lib\Vengine.jar -Dsun.java2d.d3d=false VASSAL.launch.Player --load -- G:\My Drive\Downloads on ASUS RoG Laptop\CCNapoEpic3a41.vmod
2021-04-03 00:13:13,995 [25868-main] INFO VASSAL.launch.StartUp - Starting
2021-04-03 00:13:14,022 [25868-main] INFO VASSAL.launch.StartUp - OS Windows 10 10.0
2021-04-03 00:13:14,022 [25868-main] INFO VASSAL.launch.StartUp - Java version 16
2021-04-03 00:13:14,022 [25868-main] INFO VASSAL.launch.StartUp - VASSAL version 3.5.5-SNAPSHOT-ced5666
2021-04-03 00:13:14,022 [25868-main] INFO VASSAL.launch.Launcher - Player
2021-04-03 00:13:19,622 [25868-AWT-EventQueue-0] INFO VASSAL.script.ExpressionInterpreter - Attempting to load /VASSAL/script/init_expression.bsh URI generated=jar:file:/C:/Program%20Files/VASSAL-3.5.5-SNAPSHOT-ced5666/lib/Vengine.jar!/VASSAL/script/init_expression.bsh
2021-04-03 00:13:22,493 [25868-AWT-EventQueue-0] INFO VASSAL.build.GameModule - Commands & Colors Epic Napoleonics version 3.00a41
2021-04-03 00:13:22,522 [25868-AWT-EventQueue-0] WARN VASSAL.i18n.BundleHelper - No Translation: Wizard.Next_mnemonic
2021-04-03 00:13:22,522 [25868-AWT-EventQueue-0] WARN VASSAL.i18n.BundleHelper - No Translation: Wizard.Prev_mnemonic
2021-04-03 00:13:22,523 [25868-AWT-EventQueue-0] WARN VASSAL.i18n.BundleHelper - No Translation: Wizard.Finish_mnemonic
2021-04-03 00:13:22,523 [25868-AWT-EventQueue-0] WARN VASSAL.i18n.BundleHelper - No Translation: Wizard.Cancel_mnemonic
2021-04-03 00:14:34,695 [25868-AWT-EventQueue-0] WARN VASSAL.i18n.BundleHelper - No Translation: Wizard.Next_mnemonic
2021-04-03 00:14:34,695 [25868-AWT-EventQueue-0] WARN VASSAL.i18n.BundleHelper - No Translation: Wizard.Prev_mnemonic
2021-04-03 00:14:34,696 [25868-AWT-EventQueue-0] WARN VASSAL.i18n.BundleHelper - No Translation: Wizard.Finish_mnemonic
2021-04-03 00:14:34,696 [25868-AWT-EventQueue-0] WARN VASSAL.i18n.BundleHelper - No Translation: Wizard.Cancel_mnemonic
2021-04-03 00:14:34,696 [25868-AWT-EventQueue-0] WARN VASSAL.i18n.BundleHelper - No Translation: Wizard.Help_mnemonic
2021-04-03 00:16:53,766 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 00:18:53,782 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 00:20:53,791 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 00:22:53,798 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 00:26:13,662 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 00:28:13,668 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 00:35:37,518 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 00:37:37,519 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 00:39:37,526 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 00:41:37,528 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 00:43:37,530 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 01:00:40,543 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 01:02:40,548 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 01:04:40,561 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 01:06:40,564 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 01:21:57,342 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 01:23:57,351 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 01:25:57,360 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 01:27:57,373 [25868-write game.vassalengine.org/62.210.178.7] WARN VASSAL.tools.logging.LoggedOutputStream - Sent keep-alive
2021-04-03 01:38:30,941 [25868-AWT-EventQueue-0] ERROR VASSAL.tools.ErrorDialog -
java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location
at java.desktop/java.awt.Component.getLocationOnScreen_NoTreeLock(Component.java:2105)
at java.desktop/java.awt.Component.getLocationOnScreen(Component.java:2079)
at java.desktop/javax.swing.JPopupMenu.show(JPopupMenu.java:940)
at VASSAL.build.module.ToolbarMenu.launch(ToolbarMenu.java:91)
at VASSAL.build.module.ToolbarMenu.lambda$new$0(ToolbarMenu.java:84)
at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1972)
at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2313)
at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:279)
at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:297)
at java.desktop/java.awt.Component.processMouseEvent(Component.java:6617)
at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
at java.desktop/java.awt.Component.processEvent(Component.java:6382)
at java.desktop/java.awt.Container.processEvent(Container.java:2264)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4993)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2322)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4825)
at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4934)
at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4563)
at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4504)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2308)
at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2773)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4825)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)