ORA-31053
The value of the DEPTH argument in the UNDER_PATH condition cannot be negative.
Cause
The optional DEPTH argument in the UNDER_PATH condition indicates the number of levels down from the specified path_string that Oracle should search. The documentation might also refer to this parameter as "levels". The value provided was a negative number. Oracle expects any non-negative integer.
Action
Correct the value for the depth or levels argument to a non-negative integer.