ORA-03127 no new operations allowed until the active operation ends
Cause: An attempt was made to execute a new operation before the active non-blocking operation completed or a new operation was attempted before all the pieces of a column were inserted or fetched.
Action: Execute the new operation after the non-blocking operation completes. If piecewise binds/defines were done, execute the new operation after all the pieces have been inserted or fetched.
But I don't know what kind of SQL operation you are performing actually