Actually.. I'm not sure

but I belive it was related with a downloaded object. But I can't remember, because it only happened once. But this other error I've attached here also occured, so I thought it was the same and that is why I was eager to know how to solve it. This new error occurs when I oppen a different level. Ex: I run FPSC, open level A, works OK. I Open level B, works ok. Sometimes I open level C, sometimes level D, and the error appears. Sometimes it also occurs when I save the level.
Intel core i7 2600k
Asus P8P67 Pro Rev
OCZ SSD Agility 60Gb
EVGA GTX660 Ti SC 3Gb
GSkill 8GB 1600 Ripjaw CL9
Corsair HX 750W Modular
FPSC V.1.20.007
DX 11
I also had DX9, but I was having BSOD's, and when I took the system to the store to see what was causing the BSOD's, it was the graphics and it went to RMA, so they probably have uninstalled DX9 and only instaled DX11.
Here, there and everywhere.