Failed to load Launcher DLL error

The error

After the map compile process has finished, the following error might occur:

Failed to load the launcher DLL:
The specified module could not be found.

The fix

1. If you are using the normal compile mode, check the Don't run the game after compiling option. If you are using expert compile mode, make sure that Hammer is not launching the game after the map is compiled.
2. After the compile process has finished, manually launch the game from Steam.
3. After the game has launched, click the "Create Server" option from the game menu, and play your map from there.

Note:If there is no "Create Server" option on the game menu, run the game with the developer console and load the map using the map console command instead.