view state validation is on

Hi Team

I created anneoload userpath with some user. but when i am checking it with different user i am getting error Validation of viewstate MAC failed. Mine is a .net application. Looks like when i am passing different user path it os still validation viewstate with recorded user. Ideal it should do it dynamically. PFA of error messgae. So to resolve is there any setting or way were at each request it will send new user viewstate data .. I mean if i recorded with userA and now running userB, userC.. so on. So it should craete viewstate at runtime while login and validate to that.