Problem with Gate installation on Linux

[maikeros]

I installed Gate with: sudo snap install gate After that I am able to open the program, but if I try to execute a macro, I always get the following error: I/O error : Permission denied I/O error : Permission denied I/O warning : failed to load external entity "./Materials.xml" I/O warning: Discard the previous warning if your simulation doesn't transport OPTICAL PHOTONS. Otherwise, please copy the ./Materials.xml file from the gate-source directory in the directory where you run your main macro. I/O warning : failed to load external entity "./Materials.xml" I/O warning: Discard the previous warning if your simulation doesn't transport OPTICAL PHOTONS. Otherwise, please copy the ./Materials.xml file from the gate-source directory in the directory where you run your main macro.

I tried to open the program as sudo, but than he doesn't even find my macro anymore. I had this problem on two different computers now. Any ideas, what could fix the problem? I am totally new to this kind of simulating and programing, so maybe it's a stupid question. Thank you!