Hi , whenever i create a map on source sdk when i run it i get
CModelLoader::Map_IsValid: No such map ‘First’ map load failed:First not found or invalid
How do i fix this problem ?
Post the compile log.
compile log ? sorry im new here 
When you use run map, a console-like window appears, and writes a lot of weird stuff. Copy that here, in [ code] tags. Remove space from [ and code]!
** Executing...
** Command: "d:\steam\steamapps\duude4ever\half-life 2 deathmatch\hl2.exe"
** Parameters: -sw -dev -console -allowdebug -game "d:\steam\steamapps\duude4ever\half-life 2 deathmatch\hl2mp" +map "first"
is that what you mean ?
No, he means the entire output of the compile window once it’s finished.
Its finished :S
he cant get to the compile window, he gets the error when ever he trys to run it…
Re-install sdk? that fixes most things, or save your map to a different name.
I Runned it on fast and it works but sometimes the lights its not working
Make sure you have every box set on normal for the compile window.
Works fine now thanks alot ! 
For fuck’s sake. This is not a solution. This is a lazy, half arsed fix that rarely works, and when it does, it will most likely only be temporary.