Oracle Solution for Error ora-19204

ORA-19204: Non-scalar value 'string' is marked as XML attribute

What triggered the Error:

ly 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 '@'

What should we do to fix it:

move the '@' sign, or make the value a scalar.