Error when launching smart client

I got this error when I launch the smart client :

Non posso caricare il record
 > com.servoy.j2db.persistence.RepositoryException: java.lang.IllegalStateException: Could not resolve column public:sec_owner<db:/svy_framework/sec_owner>#secowner20105.1073752652=?
Exception Object: org.mozilla.javascript.EcmaError: ReferenceError: "_to_nav_properties$property_name" is not defined. (C:\servoy_workspace_6.0.7\svy_nav_navigation\globals.js#4694)
MSG: ReferenceError: "_to_nav_properties$property_name" is not defined. (C:\servoy_workspace_6.0.7\svy_nav_navigation\globals.js#4694)
ReferenceError: "_to_nav_properties$property_name" is not defined. (C:\servoy_workspace_6.0.7\svy_nav_navigation\globals.js#4694)
ReferenceError: "_to_nav_properties$property_name" is not defined. (C:\servoy_workspace_6.0.7\svy_nav_navigation\globals.js#4694)
	at C:\servoy_workspace_6.0.7\svy_nav_navigation\globals.js:4694 (svy_nav_getProperty)
	at C:\servoy_workspace_6.0.7\svy_nav_navigation\globals.js:4674 (svy_nav_getBooleanProperty)
	at C:\servoy_workspace_6.0.7\svy_nav_navigation\globals.js:1482 (svy_nav_onOpen)

If I launch web client instead, no exception is raised. I’m using Servoy 6.0.7.
Any suggestion?
Thanks in advance.

What happens if you do ‘Project’-> ‘Clean’. And after that restart developer. Do you still have it than?

It works again!
Thank you very much!