The process cannot access the file because it is being used by another process issue with more than script running simultaneously

I'm using toad for data analysts in running automation scripts to receive reports by mail and I schedule it to be running at same time about 5 toad automation scripts

Simply the script has 2 components which are export to excel and send mail and some of reports are getting similar to this error

The process cannot access the file 'C:\Users\Server_User\Desktop\toadpro\Toad Exports\exporeportp\FXffvy-Report--2016-12-31 13-00-44.csv' because it is being used by another process.

So do anyone has a way to resolve this issue