Default note 2 n7100 android version 4.4.3 wifi authentication problem.

hey people i am UMD

i have a note 2 GT n7100 i flashed omni rom 4.4.3 it has been working fine for weeks now and today i found out ther the wifi was not connected and i checked it said it had authentication problem so im unable to access the net . please need a solution for this problem . i flashed the rom using philz touch recovery . the kernal is the kernal that came with the omni rom : 3.0.64-OMNI-g5f47648 and by the way nothing is wrong with my wifi it is working fine with my other devices like samsung tab 2 , s3 mini and i pad 4.

please give me a solution
Thank you !