ID:13976 VHDL error at <location>: closing alternative label (<name>) is specified without the corresponding opening alternative label.

CAUSE: You specified a closing alternative label without specifying the corresponding opening alternative label in a generate statement, which is not legal.

ACTION: Specify an opening alternative label for the generate statement, or remove the closing alternative label. Note that alternative labels are only legal in conditional and case generate statements, and not in iterative generate statements.