Okies, i compiled the map and got this error

"The system cannot find the file specified."

I dont know why it didn't work.
Here's ma log.

** Executing...
** Command: "c:\program files\valve\steam\steamapps\username\sourcesdk\bin\vbsp.exe"
** Parameters: -game "c:\program files\valve\steam\steamapps\username\half-life 2\hl2" "C:\Program Files\Valve\Steam\SteamApps\username\sourcesdk_content\hl2\mapsrc\IrIsDoOr"

Valve Software - vbsp.exe (Aug  4 2006)
1 threads
materialPath: c:\program files\valve\steam\steamapps\username\half-life 2\hl2\materials
Loading C:\Program Files\Valve\Steam\SteamApps\username\sourcesdk_content\hl2\mapsrc\IrIsDoOr.vmf
fixing up env_cubemap materials on brush sides...
ProcessBlock_Thread: 0
** Executing...
** Command: "c:\program files\valve\steam\steamapps\username\sourcesdk\bin\vvis.exe"
** Parameters: -game "c:\program files\valve\steam\steamapps\username\half-life 2\hl2" "C:\Program Files\Valve\Steam\SteamApps\username\sourcesdk_content\hl2\mapsrc\IrIsDoOr"

Valve Software - vvis.exe (May 22 2006)
1 threads
reading c:\program files\valve\steam\steamapps\username\sourcesdk_content\hl2\mapsrc\IrIsDoOr.bsp
Error opening c:\program files\valve\steam\steamapps\username\sourcesdk_content\hl2\mapsrc\IrIsDoOr.bsp

** Executing...
** Command: "c:\program files\valve\steam\steamapps\username\sourcesdk\bin\vrad.exe"
** Parameters:  -game "c:\program files\valve\steam\steamapps\username\half-life 2\hl2" "C:\Program Files\Valve\Steam\SteamApps\username\sourcesdk_content\hl2\mapsrc\IrIsDoOr"

Valve Software - vrad.exe SSE (May 22 2006)
----- Radiosity Simulator ----
1 threads
[Reading texlights from 'lights.rad']
[45 texlights parsed from 'lights.rad']

Loading c:\program files\valve\steam\steamapps\username\sourcesdk_content\hl2\mapsrc\IrIsDoOr.bsp
Error opening c:\program files\valve\steam\steamapps\username\sourcesdk_content\hl2\mapsrc\IrIsDoOr.bsp

** Executing...
** Command: Copy File
** Parameters: "C:\Program Files\Valve\Steam\SteamApps\username\sourcesdk_content\hl2\mapsrc\IrIsDoOr.bsp" "c:\program files\valve\steam\steamapps\username\garrysmod\garrysmod\maps\IrIsDoOr.bsp"

The command failed. Windows reported the error:
  "The system cannot find the file specified."

I assume that you just replaced your actual username with 'username' in the above post.
Take a look through your files and confirm that your map is located in the specified location:

C:\Program Files\Valve\Steam\SteamApps\username\sourcesdk_content\hl2\mapsrc\IrIsDoOr

Make sure you have the correct play spawn point within the map for the gametype which you are editing. If you are working in SP mode (in Hammer), then make sure you have an SP player spawn point in there.

If all of that is true, then would you mind sending me your map file? I would like to see if I get the same error.

Actually i think i just fixed it, all i did was change the directory the compiled maps go into and it worked. Thanks anyway though