I've been getting this alot, I think its an Arma issue, keep trying eventually it will let you it or alternately drop your mission pbo into your appdata folder the path for min is: C:\Users\username\AppData\Local\Arma 3\MPMissionsCache. it helps as it doesn't need you to download the mission file.
Welcome to Exiled UK
The Server is currently hosted by QGS in Manchester and is limited to 24 slots to keep costs down, if the popularity of the server increases so will the slot numbers, teamspeak etc.
Occupation Mod (Missions, roaming Ai, heli crashes etc.)
ExAdClient - Hacking, Grinding, Virtual Garage and Halo Parachute
SA Advanced Towing & igiload
10k Poptabs start
x2 High Value Hidden vehicles
Crates spawn each restart containing a base starter pack and some goodies. You still need to purchase a flag!
Vote for day/night.
You can build where it lets you, please don't block roads.
No speaking in side chat and English only text.
You can kill, steal, raid whatever you like, but don't be a dick about it.
No cheating, exploiting glitches, duping etc.. you get the drift.
We don't babysit!
** Updated 16/07/16 **
Additional mods installed
(additional items added to traders)
CUP - Vehicles, Units & Weapons
Extended Base Mod
(selected) Vehicles from HVP Mod
ACiDy Tanoa Bridges
** Updated 21/07/16 **
igiload added to server
** Updated 24/07/16 **
ExAdClient added to server - Hacking, Grinding, Virtual Garage and Halo Parachute now added
Occupation Mod & DMS tweaked and missions improved
It is the year 2039. After the resource depleting conflict in Greece, Europe suffers from a new deflation crisis, leading the crime rate to a new peak in history. Members of the North Atlantic Treaty Organization Security Council are forced to react. Being a desperate alternative to overcrowded and prohibitive prisons, offenders are now being sent to EXILE.