ERROR:root: Topology file not found

Hello,
After trying to run some code from the quickstart notebook on our own, we have encountered this error:

The problem occurs when we try to use a pre-made graph file as the topology file, even thou the file was created earlier by the ```generate_topology``` function. We tried to use ```nx.read_gml(file)``` to load the pre-made topology and use it for the functions ```create_routing, create_tm```.

All the needed files were created and placed in the same directories like in the quickstart notebook, but the above error was raised.
When we tried to immigrate the code from the notebook to our project and create a new topology file using ```create_topology``` for every run, the code ran without any problems.

We would like to note that the same "strategy" was used by us with the previous version of the docker (the one with the 10 node limitation) and it worked. What could be the reason that we receive this error now?

Thanks in advance.