Tool bar missing when installing TDM Cars

Everytime I install TDM Cars on my server, I get this error in the console

[ERROR] addons/m9k assault rifles/lua/weapons/bobs_gun_base/shared.lua:916: attempt to call method ‘GetViewModel’ (a nil value)

  1. unknown - addons/m9k assault rifles/lua/weapons/bobs_gun_base/shared.lua:916

And then my toolbar goes missing.

If I removed M9K then everything works again but I really like M9K.

Everybody else also has this problem.