SOMA Mod error during initialization

[Caterpillar]

In Steam, I select "Play Mod" then "Play Custom Content" and I select any MOD. Then "Launch Content"->"Ok" and I get the following error

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Failed parsing of XML document /run/media/user/52552f10: file not found

Note that the SOMA path is

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/run/media/user/52552f10-a031-1a02-76k8-treyghfj4352/SteamLibrary/steamapps/common/SOMA/

so it seems that SOMA cutted the path...
SOMA regular game plays without any problem.
Operating System: Fedora 25, VGA: Radeon RX480 with amdgpu drivers