Hammer Error

[Toxi-Breather]

I need some help with my Hammer World Editor. I can't add any textures to my maps, because when I do that my Hammer quits. It say

"The instruction at "0x0d6d3618" referenced memory at "0x0d6d3618" The memory could not be "read". Click on "ok" to terminate the program."

Can anybody help me with this problem. It begins to be a pain in the a*s. Thank you.
Edit/Delete Message

 

[Unarmed]

What game are you mappng for?

Is it possibly a pre ep2 game being mapped for but without the -engine ep1 command?

 

[Toxi-Breather]

What should I do?

 

[Toxi-Breather]

i'm mapping for ep2

 

[Unarmed]

Hmm... If youre in for ep2 i suggest reinstallning the sdk...