I found the problem, but why is that?
I had deactivated the RawInput plugin and therefore it no longer worked. Now I have activated it and I can do “Launch” again. Now everything is working again. But what does this plugin have to do with SteamAdvancedSession? I have only set true to false and i get this Error.
{
"FileVersion": 3,
"EngineAssociation": "4.25",
"Category": "",
"Description": "",
"Plugins": [
{
"Name": "HoudiniEngine",
"Enabled": false
},
{
"Name": "AdvancedSteamSessions",
"Enabled": true
},
{
"Name": "AdvancedSessions",
"Enabled": true
},
{
"Name": "RawInput",
"Enabled": true
}
]
}