I use 'str_width' to get the width of the displayed string.. I use it in the main function, and I don't load any levels, but why do I get this error??
I know how can I fix this, but I'm just curios, why does 'str_width' cause this problem?

I am not sure but maybe str_width is calling a DirectX function and thus the error is thrown.

Maybe, I don't know.. But anyway, this looks strange at the first place to me. And it should had something about this in the manual I guess.



Greets

The manual in GameStudio has many flaws and LOTS of things aren't described the way they should be, most times i have to google something that the manual should explain
In my experienci, whenever that error ocurred in my scripts i just added a wait(1); to wait 1 frame before the line that was causing this error. So, if it has something to do with the video it may have something to do with DirectX, like Superku said
try googling "lite-c str_width" and search around some websites

Lite-C (and other engines) use DirectX to check how wide a text is. But for this you need a DirectX device so just wait until total_frames is higher than 0 before calling wait(1);

ok, it's clear now, thank you all.

I had the same issue and I prefer MasterQ32's solution:

while(total_frames < 1) wait(1);