Having issues using oracle's OTT utility

Having issues using oracle's OTT utility

This is the command I run on the command prompt:
ott userid=username/password intype=object.typ outtype=objectOut.typ
code=cpp hfile=temp.h cppfile=temp.cpp
mapfile=tempmapfile.cppset
This is the error i get:
O2T-1118, Unable to register the connection
O2T-102, ERROR: Unable to connect to schema "username"
I can't figure out how to properly register my connection. Can someone
help shed some light on this issue I'm having?