Half-Life 2 Hammer error Thread

So, basically i'm trying to work on a mod for Hl2, however whenever i start up Hammer i get this error:

Failed to load the default scheme file. The map views may be missing some visual elements.

I then press ok, and... well

Could someone please help me fix this...

Don't know if you still have this problem, if so then just reply again please
and i will help you with it. There are several issues that can cause this,
all very easy to fix. Just let me know,

a fellow mapper,
Leon

The steam forums have solutions to this, if I recall there was something to do with like options and then reapplying some settings or .vis files again. I dunno, it's been years since I picked up hammer. Hope you find a fix!