problems running project

[Schulte, Richard]

I migrated a project from Netbeans 8/JDK 8 to Netbeans 9/JDK 10.  The project 
builds successfully, but it fails with 'Error: Could not create Java Virtual 
Machine.  Error: A fatal exception has occurred'.  I can run the project from a 
script file, so it works if everything is set up correctly.  Can someone 
provide a pointer to how Netbeans'  Run -> Run Main Project starts the project? 
 How can I determine what exception is being thrown?
thanks