Did you make this with Hammer++? I ask because the actual map itself is an LSD simulator. Yes, the background of H++ will display whatever skybox is specified in the Properties tab, but that doesn't mean there's a skybox actually present. For that, you'll need the tools/toolsskybox texture.
There are also great big ERROR models in your map. If you're using custom assets, you'll need to pack all your non-standard assets into your map, with CompilePal.
KOTH Maps need to start with their control point model hidden, so players dont get the wrong idea an think that the inactive point is active. In the Flags tab of the control point entity, check the box for Start With Model Hidden, then when the point becomes active, send the control point a ShowModel command.
Also, the map needs at least one info_observer_point. Without it, your map has an unlikely potential to crash, but its still nice to have regardless.
These issues were discovered in less than 5 minutes of roaming around your map. Please do conduct a thorough tour of your map before you release it, it shows the community that you care about quality, and you're not intending to waste people's time.