OS 2.5 Run simulation failed

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I am starting to use open studio. I am using version 2.5 compatible with sketchup make 2017. The first problem I have is that when I want to open an .osm file I get "Failed to open file: ......". So it is impossible to open an already modified file. Another problem is that when I want to run the simulation, it starts and I get a message "failed". Please help!