Can't enter server

Gamemode: HL2RP
Brief Description of the Issue: I can't enter the server
Item: (If the issue regards an item, or else leave blank.)
Entity: (If the issue regards an entity, or else leave blank.)
What does the issue regard: (If none of the above parts is good to describe it. Or else leave blank) When I connect to the server, it shows the openaura loading screen. After it has finished loading, I only see the black/gray gradient
When does the problem occur?: When I try to connect to the server
How is the screen?: (If the screen turned a different color, or the color didn't change. Or else leave blank.) Black/gray gradient
What's written on the screen?: (If there's anything written on the screen that I should know, or else leave blank) Nothing, that's the problem!
What does console say, that I should know?: It repeats Failed, using default cubemap 'engine/defaultcubemap' many times. Then it says "No pure server whitelist sv_pure = 0" after that, it shows the regular stuff, including game things like light respawns
Additional Notes: None.