Couldn't execute command:

[jgee-heatcon]

4diac IDE version: 3.1.0.2026-03-11_1726

Session ID: bab1e769-a302-485c-a315-0c938dcda386

Stack trace

org.eclipse.core.commands.ExecutionException: While executing the operation, an exception occurred
	at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:496)
	at org.eclipse.fordiac.ide.gef.commands.OperationHistoryCommandStack.execute(OperationHistoryCommandStack.java:108)
	at org.eclipse.gef.dnd.AbstractTransferDropTargetListener.handleDrop(AbstractTransferDropTargetListener.java:353)
	at org.eclipse.gef.dnd.TemplateTransferDropTargetListener.handleDrop(TemplateTransferDropTargetListener.java:119)
	at org.eclipse.fordiac.ide.application.utilities.FbTypeTemplateTransferDropTargetListener.handleDrop(FbTypeTemplateTransferDropTargetListener.java:96)
	at org.eclipse.gef.dnd.AbstractTransferDropTargetListener.drop(AbstractTransferDropTargetListener.java:194)
	at org.eclipse.jface.util.DelegatingDropAdapter$3.run(DelegatingDropAdapter.java:227)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:169)
	at org.eclipse.jface.util.DelegatingDropAdapter.drop(DelegatingDropAdapter.java:224)
	at org.eclipse.swt.dnd.DNDListener.handleEvent(DNDListener.java:104)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4349)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1217)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1241)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1226)
	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:863)
	at org.eclipse.swt.dnd.DropTarget.Drop(DropTarget.java:488)
	at org.eclipse.swt.dnd.DropTarget.Drop_64(DropTarget.java:406)
	at org.eclipse.swt.dnd.DropTarget$1.lambda$2(DropTarget.java:271)
	at org.eclipse.swt.internal.Win32DPIUtils.runWithProperDPIAwareness(Win32DPIUtils.java:94)
	at org.eclipse.swt.dnd.DropTarget$1.method6(DropTarget.java:267)
	at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java:120)
	at org.eclipse.swt.internal.ole.win32.COM.DoDragDrop(Native Method)
	at org.eclipse.swt.dnd.DragSource.drag(DragSource.java:553)
	at org.eclipse.swt.dnd.DragSource.lambda$0(DragSource.java:380)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4349)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1217)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4147)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3735)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1160)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1051)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:684)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:583)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:173)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:185)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:219)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:149)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:115)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:467)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:298)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:615)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:563)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1415)
Caused by: java.lang.ArrayIndexOutOfBoundsException: Index -1 out of bounds for length 4
	at org.eclipse.emf.common.util.BasicEList.get(BasicEList.java:347)
	at org.eclipse.fordiac.ide.model.helpers.InterfaceListCopier.getCopiedVar(InterfaceListCopier.java:181)
	at org.eclipse.fordiac.ide.model.helpers.InterfaceListCopier.copyWiths(InterfaceListCopier.java:169)
	at org.eclipse.fordiac.ide.model.helpers.InterfaceListCopier.lambda$4(InterfaceListCopier.java:149)
	at java.base/java.lang.Iterable.forEach(Unknown Source)
	at org.eclipse.fordiac.ide.model.helpers.InterfaceListCopier.copyEventList(InterfaceListCopier.java:147)
	at org.eclipse.fordiac.ide.model.helpers.InterfaceListCopier.copy(InterfaceListCopier.java:56)
	at org.eclipse.fordiac.ide.model.libraryElement.impl.InterfaceListImpl.instanceCopy(InterfaceListImpl.java:353)
	at org.eclipse.fordiac.ide.model.commands.create.FBCreateCommand.createInterfaceList(FBCreateCommand.java:83)
	at org.eclipse.fordiac.ide.model.commands.create.AbstractCreateFBNetworkElementCommand.execute(AbstractCreateFBNetworkElementCommand.java:68)
	at org.eclipse.fordiac.ide.model.commands.create.FBCreateCommand.execute(FBCreateCommand.java:70)
	at org.eclipse.fordiac.ide.gef.commands.OperationHistoryCommandStack$CommandWrapper.execute(OperationHistoryCommandStack.java:252)
	at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:488)
	... 49 more

[azoitl]

@jgee-heatcon thx for reporting. From the stack trace I can see that the problem happens when creating an FB instance. Do you remember what FB instance you tried to create. Would it be possible that we get the FB Type. Because something strange seems to be in the type definition.

[jgee-heatcon]

Hi Alois, Thanks for the fast response. I will look more into this tomorrow. And see what I can find. It may very well be a strange FB I tried to autogenerate via code. And I I will remember to put more comments the report if/when I run into a similar error. It may register as being when created, but I noticed the crash when trying to click and drag the FB. I am still new to FORTE, I am excited about the potential though. Joseph Gee Embedded Systems Engineer Heatcon Composite Systems, Inc. Email: ***@***.******@***.***> Telephone: +1 (206) 575 1333 Ext 5614 Address: 480 Andover Park East, Seattle,WA,98188, USA ***@***.*** website<http://www.heatcon.com/> | customer survey<https://www.surveymonkey.com/r/heatconcs> [LinkedIn copy]<https://www.linkedin.com/company/heatcon-composite-systems>[Instagram Logo]<https://www.instagram.com/heatcon/> From: azoitl ***@***.***> Sent: Monday, April 06, 2026 10:34 AM To: eclipse-4diac/4diac-ide ***@***.***> Cc: Joseph Gee ***@***.***>; Mention ***@***.***> Subject: Re: [eclipse-4diac/4diac-ide] Couldn't execute command: (Issue #2368) [https://avatars.githubusercontent.com/u/5267986?s=20&v=4]azoitl left a comment (eclipse-4diac/4diac-ide#2368)<#2368 (comment)> @jgee-heatcon<https://github.com/jgee-heatcon> thx for reporting. From the stack trace I can see that the problem happens when creating an FB instance. Do you remember what FB instance you tried to create. Would it be possible that we get the FB Type. Because something strange seems to be in the type definition. — Reply to this email directly, view it on GitHub<#2368 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BUUMXTOUITYW74H2U53VHQD4UPTABAVCNFSM6AAAAACXMFYIHKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DCOJTHA3TINRTG4>. You are receiving this because you were mentioned.Message ID: ***@***.******@***.***>>

[azoitl]

@jgee-heatcon thx for this feedback. This explains a bit why this happend. Normally I'm quite good to reason on stack traces on the problem but the one you submitted is quite strange. In your workspace you have a .metadata directory and there a .log file. Maybe there is more information that could help.