ID:13955 VHDL Scope error at <location>: design unit "<name>" is not visible in the present scope - you must refer to it with an expanded name such as "work.<name>"

CAUSE: In a name at the specified location in a VHDL Design File (.vhd), you referred to the specified design unit using a simple name, which requires the design unit to be visible in the present scope. However, unless you explicitly import the design unit name with a use clause, you must refer to the design unit with an expanded name that indicates the library that contains the design unit.

ACTION: Use an expanded name to refer to the design unit or import its declaration into the present scope with a use clause.