Dataflow derive column from parameter Error DF-EXPR-013

I have a dataflow with a int parameter "CableStationNumber"

When I use a Derive Column action to make a CableStationNumber column with the value equal to $CableStationNumber (the data flow parameter) I get a DF-EXPR-013 Incompatible datatypes between declared type and actual parameter value.

As a result in my sink, I get a DF-EXPR-010 DF-EXPR-010 at Sink 'sink1'(Line 58/Col 18): Column 'CableStationNumber' not found. The stream is either not connected or column is unavailable.

The preview data shows everything correctly from source to sink, but when I debug the actual dataflow, I get the errors.

When I set CableStationNumber to an actual int like 123, it works. Please advise.