First off: are you near spawn? Sanic has spawn protection on by default. They won't chase you if you're within 200 units of a spawnpoint (but they can still attack you).


You're not near spawn and Sanic still won't move? Alright. Let's get into some details.

Sanic is based on the new NextBot AI in Garry's Mod. Because of this, they might not be able to move on maps where other NPCs can. To solve this problem, simply run nav_generate to create a navigation mesh for Sanic's pathfinding and awareness. However, please note that this could take a long time, and it WILL restart your map. Hang on, though. There are a few other potential issues you may encounter.

When you run the above command, it'll search for walkable areas beginning from a spawn point. If there are areas on the map you would like Sanic to walk on that are not directly accessable from spawn by doing nothing but walking, you'll need to look at them and run nav_mark_walkable (with sv_cheats set to 1!) to let the generator know people can walk in that area. For instance, the grassy area on gm_flatgrass requires you to jump down to reach it. Therefore, you'll need to run nav_mark_walkable while looking somewhere on the grass.

If there is already a navigation mesh file for the map, and it's not working, you're going to need to delete it manually. First, exit Garry's Mod--it'll probably be hanging onto the file and won't let you remove it. Next, navigate to your Garry's Mod directory, and locate maps/<mapname>.nav, where mapname is the name of the map you're trying to generate a navigation mesh for. Delete or rename this file, relaunch Garry's Mod, and try again.