ID:10471 VHDL attribute error at <location>: attribute "<name>" is used but not declared

CAUSE: In an Attribute Specification at the specified location in a VHDL Design File (.vhd), you used the specified attribute. However, you did not declare the attribute in an Attribute Declaration. You must declare an attribute before you can use it.

ACTION: Replace the attribute with a previously defined attribute, or define the attribute in an Attribute Declaration. However, do not define an attribute with the name you used in the Attribute Specification if you already used the name for a different construct.