Error:

Failed to execute runnable (org.eclipse.swtException:Widget is disposed)

Resolution:

This issue occurs when you are directly dragging workflow to process studio instead of importing.

If you have designed the workflow in lower version of process studio and if you want to run the same on the latest version of process studio then instead of dragging you need to use the import option to open the Workflow in latest PS.

When you import the older workflow in latest PS, it will automatically upgrade all the required plugins in the workflow with the current version.