I am trying to run 100 users test and is a single script which logs in the user does some activity and logs out the user.

i am getting a error msg saying "Failed to transmit data to the server " at the location where submit_data takes place,
what could be the reason for that, secondly

i am also getting error msg saying the max download time for 1000 secs has expired,how do i get rid of this too..

I am trying to put some data in some users (1-100)but i am observing that LR isnt putting data into the folders for user1-100, ideally i would think that it should put data for user 1 and then proceed ahead for user2 , this isnt happening, anyone could analyse why this happening? where am i doing wrong?