ID:13643 VHDL error at <location>: can't determine definition of operator "<name>" -- found <number> possible definitions

CAUSE: In a VHDL Design File (.vhd) at the specified location, you used the specified operator. However, Quartus Prime Integrated Synthesis cannot determine the definition of the operator because no definition exists or Quartus Prime Integrated Synthesis found the specified number of different possible definitions for the operator.

ACTION: Make sure the design clearly specifies the definition of the operator.