jmeter - Error occurs as soon as the script run for more than 1 thread/user, it works flawlessly for 1 thread/user -

i recorded complex scenario , correlated dynamic parameters.

i'm extracting dynamic parameter i.e. customer through regular expression extractor. , passing subsequent requests.

the subsequent request(s) getting executed 1st thread/user , failing other thread/user.

but error occurs script run more 1 thread/user, works flawlessly 1 thread/user.

why so, ideas ?

you didn't correlate dynamic data can be:

• in header

• in requests