# T-rex (No GTPPDUSessionContainer issue) ## ubuntu 18.04 Issue: NameError: name 'GTPPDUSessionContainer' is not defined Solution: Because there's no 'GTPPDUSessionContainer' in t-rex, copy the library from the library of python3.6 ```sudo cp /usr/local/lib/python3.6/dist-packages/scapy/contrib/gtp.py /opt/trex/v2.97/external_libs/scapy-2.4.3/scapy/contrib/gtp.py```