Error at map change???

[SPi 141]

Hi. I got an error in one of my maps.
So the map is named intro. every time i change map during in this map 
like i type in console /devmap rooftops_a or i do it with script Changelevel("rooftops_a"); it shows me this error.
http://qs.lc/gd9fb


Ive searched entities for wrong targetnames missing textures etc but nothing. Its a tiny map and i couldnt find anything. 

I eventually saved the map as introb and same with script and its fine. But id like to know what caused it.... Any ideas?

[Sentrex 785]

Personally I have no idea, however I have moved the topic to the correct place

[SPi 141]

ok good

[BraXi 753]

You've used material "white" in your map which is a 2D material and cannot be applied to map geometry, just open your .map,and replace it with something else.