Cannot import from repository to Design Center

Question

Why when I try to import an object from repository into the design center of Warehouse Builder, no objects are imported and when I save all this error message is shown:
API5072: Internal Error: Null message for exception.  Please contact Oracle Support with the stack trace and details on how to reproduce it.
oracle.wh.util.Assert: API5072: Internal Error: Null message for exception.  Please contact Oracle Support with the stack trace and details on how to reproduce it.
The stack trace is the following:
+     at oracle.wh.util.Assert.owbAssert(Assert.java:51)+
+     at oracle.wh.ui.jcommon.OutputConfigure.showMsg(OutputConfigure.java:216)+
+     at oracle.wh.ui.jcommon.CommonUtils.error(CommonUtils.java:297)+
+     at oracle.wh.ui.console.commands.CommitCmd.performAction(CommitCmd.java:27)+
+     at oracle.wh.ui.console.commands.TreeMenuHandler$1.run(TreeMenuHandler.java:188)+
+     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:189)+
+     at java.awt.EventQueue.dispatchEvent(EventQueue.java:478)+
+     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)+
+     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)+
+     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)+
+     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)+
+     at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)+
In this way, I can't import any object from repository and the only way to create a new object is to create it on Design Center and then deploy it. It's so boring creating table or views adding a field by hand...

Answer 1

The issue may be a bit more complex than just missing roles. If a target schema has been rebuilt (i.e. dropped and recreated) you will need to re-register it as a valid location with it's local runtime repository.
I have, on a couple of occassions, had problems re-registering a user through the GUI if that schema was not unregistered prior to being rebuilt. Make an OMBPLUS connection to the runtime environment on the instance where your target is located, and re-register it with:
OMB+> OMBCONNECT OWB_MGR/OWB_MGR_PWD@YOUR_HOST:YOUR_PORT:YOUR_SRVC USE REPOSITORY 'OWB_MGR_SCHEMA'
OMB+> OMBUNREGISTER USER 'TARGET_SCHEMA' IDENTIFIED BY 'TARGET_SCHEMA_PASSWORD'
OMB+> OMBREGISTER USER 'TARGET_SCHEMA' SET PROPERTIES (DESCRIPTION, ISTARGETSCHEMA, TARGETSCHEMAPWD) VALUES ('TARGET_SCHEMA', 'true', 'TARGET_SCHEMA_PASSWORD')
OMB+> OMBSAVE
OMB+> OMBDISCONNECT