Error when starting the tool after restart

An internal error occurred in: java.lang.NullPointerException The error may have affected the application state. Please notify vendor. Stack Trace: java.lang.NullPointerException at com.onseven.dbvis.j.A.C.ā(Z:1587) at com.onseven.dbvis.j.A.A.Ҳ(Z:2208) at com.onseven.dbvis.B.ט(Z:2108) at com.onseven.dbvis.B.ן(Z:1280) at com.onseven.dbvis.C.Ĉ(Z:314) at com.onseven.dbvis.DbVisualizerGUI$2.run(Z:657) at java.awt.event.InvocationEvent.dispatch(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$400(Unknown Source) at java.awt.EventQueue$2.run(Unknown Source) at java.awt.EventQueue$2.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at com.onseven.dbvis.N.A._.dispatchEvent(Z:483) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) System Information: Product: DbVisualizer Pro 90.1860 Build: #1860 (2012/11/12 11:50) Java VM: Java HotSpot(TM) Client VM Java Version: 1.6.0_37 Java Vendor: Sun Microsystems Inc. OS Name: Windows XP OS Arch: x86 OS Version: 5.1