Help with MSKerb5 Hash

[kommisar]

Hi
I am struggling to get oclHashcat to crack the Kerberos 5 AS-REQ Pre-Auth hashes , I get a line length exception , I have attempted to use oclHashcats example hash

Code:

4e751db65422b2117f7eac7b721932dc8aa0d9966785ecd958f971f622bf5c42dc0c70b532363138363631363132333238383835

I get the same error when using my hashes (obtained via Cain ) , sorry I am still a bit of a noob  am I missing something obvious?
Thanks for any help.