TD 6.0 produces the following error when trying to launch winrunner script remotely on another pc:

TestDirector cannot execute the current automated test
TDAPI_SetRunValue :: Cannot set a propertie of run.General database failure
CRun :: SetRunValue
CBaseAPI :: SetValue
CBaseAPI :: CreateUpdateSQL
BaseCursor :: ExecPreparedSQL
cursor.cpp ; DbiQExec ; L1631
Error:Key violation.

The message appears in the status column of the Test Run Scheduler. Any ideas?