Metamap coming up with error. How can I fix it?

[bbwn1233]

http://i.imgur.com/CXmQlCA.jpg
I tried to look, but I found nothing. Could anyone help?

[Valandar]

Lots of addons will spit out LUA errors like that, especially on private servers where the scripting is a bit different. Install and addon like Improved Error Frames that will hide these kind of errors. Heres one:

http://addons.us.to/addon/improvederrorframe