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You're passing a path that is not an absolute path. See #q331346 for a related question.

To be precise, there are two issues here:

1. ~/home/mattia/.. is not a valid path: ~ already evaluates to /home/mattia, so this would evaluate to /home/mattia/home/mattia.
2. ~ is evaluated (ie: replaced) by the shell (ie: bash), not roslaunch. So roslaunch doesn't do anything with it and passes the path directly to whatever tool/node/script it is that you're trying to start. As ~ is not a valid path, it will fail to open it (as evidenced by the "Error opening file" that you see).