Statechart Checks : (C2037) Junction, selection, condition, history or diagram connectors with exits but no entrance

(C2037) Junction, selection, condition, history or diagram connectors with exits but no entrance

There are junction, selection, condition, or history connectors, or a group of in-page diagram connectors with the same name, having exits but no entrance. Therefore, there is no compound transition between states, including the existing transitions.
Error In:
Completeness
Erroneous Elements:
Connectors