This may be due to the file being used by two projects at the same time.
In any case, I would like to ask you to attach the file and the projects so that I can look into your problem. You can attach the files here or in a private message on the forum.
I fixed my problem by deleting the first row everytime Im done with it. So now I create a excel file, everytime script works on first row, it deletes it and second row becomes first one and works like that.
