ORA-19204: Non-scalar value '[string]' is marked as XML attribute
Cause: Only scalar values (i.e. values which are not of object or collection type) can be marked as XML attribute,i.e. is prefixed by ''@''. In this case, a non-scalar value was prefixed with ''@''
Action: Remove the ''@'' sign, or make the value a scalar.
Error Type: ORA