Alrighty, firstly, thanks for reading, I'm really hoping I can get some help here. I'm new to map-making, so far I've made 3 using the workshop. I've played a few really great maps made by others of this wonderful community, and it was very obvious that they were made using the authoring tools, so, I decided, why not learn myself?
I downloaded the tools via steam, and I followed: https://developer.valvesoftware.com/wiki/Level_Design_Introduction_(Portal_2)/Your_First_Level
this guide to start me out. I did everything that was listed, and I am going to assume I did it correctly. However, when I try to run the map, I can't, and I have no clue as to why.
Is it because it's attempting to launch the game when, according to steam, I'm already "playing" the authoring tools?
I run Windows 7, and my OS is, I beleive, a 64 bit. Any help at all would be appreciated. I don't want to publish the map to the workshop for obvious reasons, one being it isn't a playable map, since I followed the instructions of the URL above, two being, even if it WAS an actual map, I'd want to test it out myself first.