try ing to move a file "The process cannot access the file because it is being used by another process."

Hiii guys.

I have problems with no solution available on the net, hpe youll be able to help me.

I have created a package. It takes excel file in one folder, the package loop through the folder  takes a file, the loops through the excel to read alle data from the worksheet. then move the excel files from its actual folder to another folder. 

My problem is that it keeps bugging and i get :

File System Task: An error occurred with the following error message: "The process cannot access the file because it is being used by another process.".

Do you have a solution to this problem.. please help...

Vayl1