Quartus

Verilog HDL error at <location>: replication multiplier contains X

CAUSE: In a Verilog Design File (.v) at the specified location, you used a replication operation with a multiplier value that contains a don't care (X) value. A replication operation must contain a non-zero, non-X, and non-Z constant expression.
ACTION: Make sure the multiplier value in a replication operation is a non-zero, non-X, and non-Z constant expression.

See also:

Section 4.1.14 of the IEEE Std. 1364-2001 IEEE Standard Verilog Hardware Description Language manual

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