my l4d2 chrashes because of my own map

[The Big LeBosewski]

ok ive made my first own survival and ive downloaded it from my workshop but when i start l4d2 it chrases nearly immedialty

[Rectus]

You seem to have uploaded a source file of your map, instead of a proper add-on. Follow this guide for creating one: https://developer.valvesoftware.com/wiki/L4D2_Campaign_Add-on_Tutorial