[CS:GO] client cant download

I setup a dedicated server with workshop maps but when a player tries to join it gives them this error.

Quote:Counter-Strike: Global Offensive

Map: workshop/180491134/awp_lego_3
Players: 1 (0 bots) / 10 humans
Build: 6040
Server Number: 3

SignalXWriteOpportunity(3)
Got pure server whitelist: sv_pure = 1.
Missing map maps\workshop\180491134\awp_lego_3.bsp, disconnecting


Host_Error: Disconnected

I know how to fix this on gmod with lua but I have no clue with CS:GO.