AssertPreCondition Error

[pengy]

Code:

[root@XXXX gmod]# ./steam -command update -game gmod -dir XXXXX
Checking bootstrapper version ...

AssertPreCondition
Name: NonNullFilePath
Expr: !sFile.empty()
Line: 334
File: ../../../Common/Misc/FileUtil.cpp
Aborted

I get this error with installing any new game. Does anyone know how to fix it?