Template:en

This error is due to search path problems for SDK tools. To fix the problem, copy Steam\config\SteamAppData.vdf to sourcesdk\bin\config.

If above don't work for you try this instead.

Copy the folder called "config" from "C:\Program Files\Steam" Then Paste it here

"C:\Program Files\Steam\steamapps\common\sourcesdk\bin"
"C:\Program Files\Steam\steamapps\common\sourcesdk\bin\ep1\bin"
"C:\Program Files\Steam\steamapps\common\sourcesdk\bin\source2007\bin"
"C:\Program Files\Steam\steamapps\common\sourcesdk\bin\source2009\bin"
"C:\Program Files\Steam\steamapps\common\sourcesdk\bin\orangebox\bin"

Now that error "Can't find steam app user info" should be gone for all tools you use, like for guistudiomdl 2.2.