if some one could tell me what im doing wrong ?
The ENC28j60 is a much different chip than the one used on the Official Arduino Ethernet Shield, so it takes different libraries to run it, it consumes more memory, and none of the official examples will work.
There was someone at one time working on a "unified" driver for the ENC28j60, so that it would use the same library calls to do the same things, but I don't think they got very far. Check here: Arduino Forum