ID:13381 Verilog HDL error at <location>: part-select has negative or zero size, but must use one or more bits

CAUSE: In a Verilog Design File (.v) at the specified location, you have used a part-select of a vector with a negative or zero size. However, the part-select must select at least one or more bits.

ACTION: Make sure all part-selects in the design select a partial array of one or more bits of their vector.