My Sweet Home 3D Project doesn't have 3D visuals anymore

[HBA]

This is the output of the plugin:

Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: cannot open system clipboard
at java.desktop/sun.awt.windows.WClipboard.openClipboard(Native Method)
at java.desktop/sun.awt.datatransfer.SunClipboard.getClipboardFormatsOpenClose(SunClipboard.java:322)
at java.desktop/sun.awt.datatransfer.SunClipboard.isDataFlavorAvailable(SunClipboard.java:183)
at com.eteks.sweethome3d.swing.HomePane.checkClipboardContainsHomeItemsOrFiles(Unknown Source)
at com.eteks.sweethome3d.swing.HomePane.access$3100(Unknown Source)
at com.eteks.sweethome3d.swing.HomePane$72.flavorsChanged(Unknown Source)
at java.desktop/sun.awt.datatransfer.SunClipboard.lambda$checkChange$2(SunClipboard.java:435)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
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)

This block keeps repeating while the program ist running.

[Daniels118]

This error happens to me too every time I press CTRL+C outside of the program, however it doesn't break any function.

I fear you have to share the home file to let us help you.