Error loading simbrain files on Ubuntu

Hello! and sorry for my bad english...

I get warnings like "Could not find workspace file ./simulation/sims/vehicles/two_agents.sim" each time I'm trying to open a file. It's the only thing not working correctly. How can I solve it?

Instalation path is /home/[userfolder]/../Simbrain2/, and I don't execute it with root user. I don't know if this is important.

Thanks!