problem with multithread (Run List The process can not access the file)

[r77cafe]

hi all
got a little problem with my project - after using multitread (5) i got error like that

"Run List The process can not access the file "C: \ Users \ OEM \ Desktop \ numbers.txt" because it is being used by another process." (translate by google)

and numers of threads decreasing to 1

any solution how to fix it ?

 

[r77cafe]

at save brick i was using bad exit and loop it with green dot with 1s pause - its working