Statechart Checks : (C2113) Switch/Case structure missing default entry

(C2113) Switch/Case structure missing default entry

The switch_c statement is missing the default case entry, or the case_ada statement is missing the others when_ada entry.
Error In:
Completeness
Example:
switch_c (X)
{
case_c 1:
Y=1;
case_c 2:
Y=2;
}
Erroneous Elements:
Actions, states, and transition labels