You don't have enough proxies in the file most likely.
Maybe the Run number is set to more than one when there is only 10 proxies.
It is hard to say without seeing the script
to be more clear, can i run the commands that are inside for loop http://prntscr.com/sp3lry in multiple threads ? I tried but couldnt achieve it, please help
Use the "LinesFromFile" resource with the "Only write" option