you need to add: -m 2500 (see http://hashcat.net/wiki/doku.php?id=example_hashes ), otherwise hashcat does not know what type of hash you want to crack
Code:
oclHashcat-plus64.exe -m 2500 -a 3 -1 ABCD1234uyt -o output.txt --increment dobry.hccap ?1?1?1?1?1?1?1?1