Hello TuhinG79, it looks like that you run the recorded simulation, and encounters a mismatching request. The best thing to do is capture the first GET response and grep the SessionID (e.g.

.get("/prweb/mFW9vHBT7hxOijRsFawQ3gjY0WwvMBOc*/!STANDARD")

 )

insert the grepped sessionID (as a val between {}) in your copy of the recorded simulation and put it in your ChainBuilder. A simple example for login into Pega is like this: 

  val LoginLogout: ChainBuilder =
    exec(
      http("LoginForm")
      .post("/prweb/")
        .basicAuth(username,password)
      .check (currentLocation.transform (s => {
          val pattern = """.*/prweb/(.*)/.*""".r
          val pattern(temp) = s
          temp
        }
      ).saveAs ("magictoken"))

    )
    .pause(10)

Hope this is getting you there.

Grtz. Erik van der Made

Test Consultant

Valori Chapter Pega

Valori is an independent Pega Test Partner