Problem with shrinker 3.4

Ok guys!!!!!! I am a newbie so please help me with this.
I have a target packed with shrinker 3.4. I load it in olly 1.10 trace thru the unpacking routine and reach the oep. I try to dump at the oep using the ollydump plugin but i get an error message saying that cant read memory from 401000 to 401800 where 401000 being the oep. So i cant dump at the oep but i dont get such messages with UPX and Aspack. Is it an antidumping trick or something is wrong with the way i am trying to unpack