when i replay the script.

i got the error
the session value is @@@@0427669107.1227271123@@@@
the session value is =ccchadefkfdimgicefecehidfhfdfkk.0
i was able to capture the session but after the next screen it show the error. i am checking manually it is working.
how we can solve the issue?

502 Bad gateway;
invalid response from gateway or upstream server. Requested URL: http://www.-bin/bv60.dll/booking/planner.do. in main_agenda at line 55

Test Failed: The number of errors is equal to or greater than 1.

any body please let me know if u know the answer