Whats wrong?

[Spencer14]

I logged onto tekkit and it asked if i wanted to update so i clicked yes. when it was done i went to my server and tried to log in. when i did this popped up.

How do i fix this? Thanks

[DanielJin]

The server is using a different tekkit version than you. Try to go back to rec build you were using.

[Xylord]

I logged onto tekkit and it asked if i wanted to update so i clicked yes. when it was done i went to my server and tried to log in. when i did this popped up.

How do i fix this? Thanks

Your version is probably 3.1.2. What is the version of your friend's server?

[Torezu]

Your version is probably 3.1.2. What is the version of your friend's server?

Based on the mods on the list, 3.0.4, which needs 3.0.3 as a client.