setup: update error message to be more meaningful #393
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The error message shown when a flag is found when expecting a
filename wasn't clear as it didn't communicate what was wrong
using the 'suitable' words in all cases.
Correct case,
Incorrect case,
The above case is incorrect as "some random regex" isn't a filename
in this case.
Change the error message to be general and communicative. This results
in the following output,
Signed-off-by: Kaartic Sivaraam kaarticsivaraam91196@gmail.com