Template:en

This error is due to search path problems for SDK tools. To fix this, create a folder named "config", and inside that folder create a file named "SteamAppData.vdf" with the contents:

"SteamAppData"
{
	"AutoLoginUser"		"common"
}

Copy the newly created folder Then paste it in these directories:

"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 the "Can't find steam app user info" error should be gone for all tools you use.