Problem no zone by the name zone1 exists

[YouveGotLiam]

I am running a ftb infinity 1.5.1 server, and currently no player can get back to the main world if they are in any other world, eg the nether or my quarry world. It gives the text: no zone by the name zone1 exists. Warps dont work, /home doesnt work. I have no idea whats causing this, but it used to work, can any help? Thanks.
Plugins:
ChatGuard
ClearLag
CoreProtect
Essentials, AntiBuild, Chat, GroupManager, Protect, Spawn
KeepItems
MultiverseCore
NoCheatPlus
RandomLocation
SimpleBroadcast
Towny
TownyCHat
Vault
WarpSigns
WorldBorder
WorldEdit
WorldGuard

 

[YouveGotLiam]

Ive just discovered that it is just the main world that people cant tp between, tp is possible between other worlds

 

[mc.crab]

Is there anything in the log when someone tries to use /warp, /tp or /home. Also can you try to /cofh tpx to the main world?

Also try restarting the server if you haven't.

 

[YouveGotLiam]

oh just found out that is was the randomtp plugin