bad packet id 72 HELP AS SOON AS POSSIBLE!

[FATKRAKENCaTS]

When I try and get on to my friends server recently, it says 

"Internal exception: java.io.IOException: Bad packet id 72"

I'm not sure what to do. I've tried deleting the mod-pack and reinstalling, signing out of my account on the Technic launcher, and him resetting the server,  but it  just does the same thing. I have tried searching the web but came to no conclusion why it does this. So here I am with an account, asking for help.  The version/release is 1.6.4. But yeah any help would be great! The computer I am using is a mac if that helps.

[JaariAtmc]

https://forum.feed-the-beast.com/threads/internal-exception-java-io-ioexception-bad-packet-id-72.31617/

[FATKRAKENCaTS]

Thank you but that is not the issue. I appreciate it though.. Still not working after deleting player profile so not sure what to do....