So I tried setting up Hammer++ for Source SDK Base 2013 Singleplayer so that I could make more campaign-style maps for HL2 rather than for Garry's Mod.
I followed the installation instructions in the README.txt file that came with the file I got when downloading it off the official website specifically for Source SDK Base 2013 Singleplayer, and I thought it worked. But when I try to run the map, it compiles normally but does not boot up the game despite having the executable for HL2 set in the correct place in the configuration for Source SDK Base 2013 Singleplayer
When I try to compile and load the map with Run Map in Engine Fullscreen or Run Map in Engine Windowed selected in the Run Map [Expert] menu, it pops up with an error message which will be displayed as the image for this post. I'm not sure what it means, but if anyone has an idea of what it means or how to fix this issue, please do let me know
I'm not sure how to fix this, but anyone's help would be great, and a timely response to my problem would be greatly appreciated