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ORA-00155:

cannot perform work outside of global transaction
Cause: The application tried to perform some work on either an Oracle 7.3 server or an Oracle8 server with local transactions disabled while outside of a global transaction.
Action: Check if the application is connected to an Oracle 7.3 server. The Transaction monitor must not return a NULL XID on an AX_REG call when the resource manager is Oracle 7.3. If the application is connected to an Oracle8 server, either set nolocal=f in the xa_open string or start a global transaction prior to attempting the work.
 SubjectReplies
1.truncate ORA-015521