Whenever I test my map I die within seconds of spawning. I have deleted the sky and umbra textures. (Reasons : Sky was not needed since my map is indoors, And the umbra texture was causing errors due to the sky not being there)
Don't know if that has any relevance to the error, But thanks for reading this

Do you have the player spawns set up correctly? Did you also add a info_volume for the start_zone, with script_noteworthy player_volume. If you dont have that script_noteworthy, then soon as the player enters that zone he will instantly die because the game acts like it is not a actual zone that the players can get to.