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This is a client error, try revalidating the game files on steam. The addon has nothing to do with it.
About the "missing map" issue, I just got the download working in both a collection and legacy mode here:
https://i.imgur.com/G35SnWA.png
https://i.imgur.com/E7TUUKo.png
Are you sure UWD is correctly set up on your server?
I added it about 3 months ago and 2 weeks ago it started having problems, I have removed it from my collection, cleared the cache and steam_cache, I have added it again and the problem persists, there is a possibility that you can add me on steam to be able to provide me with more information more fluently?
Join server and press escape at 3 seconds | LOGS
https://i.imgur.com/V0urDjP.png
Join the server and press escape at 6 seconds
https://i.imgur.com/VqXZKAI.png
Join the server and press escape at 8 seconds
https://i.imgur.com/w5QTsB4.png
Join server and wait till end, ERROR "map is missing"
https://i.imgur.com/FpdQjgi.png
GMOD Client user error
https://i.imgur.com/9yXhTis.png
HOST CONSOLE LOGS...
https://i.imgur.com/AVuWHmh.png
FULL VIDEO CLIENT GMOD ERROR (Joining the server, unsuscribe to my own WS collection, etc.)
https://youtu.be/wnUiq7QO5FU
Xalalau, if it's possible add me to steam, notifications will arrive on my phone and I'll be able to respond more quickly, I also want to see if I can give you access to some things in case it's useful...
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2915521445
My server id would be,
131.221.35.10:27800
The first url shows the real issue, and I just created a post about it here: https://gtm.steamproxy.vip/workshop/filedetails/discussion/2214712098/5789982181534747957/