ID:13687 VHDL error at <location>: illegal index constraint in expression

CAUSE: In a VHDL Design File (.vhd) at the specified location, you used an index constraint in an expression. However, the index constraint is illegal for the expression, for example, you may not be able to use an index constraint for a type in the expression, or you may have incorrectly specified the index constraint.

ACTION: Remove the index constraint, or make sure the index constraint is legal.