Password with known letters

[outaspace]

i tried both, the outputfile without an ending (like the original file)

hashcat -a 3 -m 16600 hash.txt combi ?a?a?a?a?a?a
error: the output from hashcat is ?a?a?a?a?a?a: unsupported file type

and the outputfile with *.txt
hashcat -a 3 -m 16600 hash.txt combi.txt ?a?a?a?a?a?a
error: Integer overflow detected in keyspace of mask: ?a?a?a?a?a?a

The combi.txt is like:
A
Ai
Ai1
i1
1u

looks like it defines all combinations.
I tried also some other text files with the brute force attack, but unfortunately this doesn't work either.

did it work for you?

Thanks for your time!