No selectable rules.

#6135 Run-time catchable error

For rule of type 'DATA-CONTENT' in element 'X'.
For rule of type 'ELEMENT' in element 'X'.
For rule of type 'ELEMENT #IMPLIED' in element 'X'.

A single rule must be selected for each element in the parsing input. For element 'X' in the input, however, no rule has been selected.