Got error 32Could not authenticate you. how to solved it. i am not get any 401 error?



hello friends,

i am new to twitter api.first i describe my problem:
first of all i create signature for http post to get any users follower list in array .(this part working fine and perfectly).but after that i create another signature for follow that users which i got in array but this time i get error so tell me where i am wrong.
i send link where i got result
if you want to see my code here is link.