That error could imply two things: There is a typo on the configuration line (it seems not unless there would be any nonreadable character).
Apache cannot find the module. Could you please check that the module is in the same place where other modules are?
I don't understand well what to you mean when you say:
I was able to get around this issue by copying the entire directory of a working setup, but that does not ultimately solve this problem.
Could you please clarify.