Excel add in error "could not load the file or assembly"

Hello,

I'm trying to upload data to the price disc journal using the Excel add in through the inbound port using the PricePriceDiscJournal service. But when I select the service in the Excel I get the following error "could not load the file or the assembly 'fiel:////C:\Users\mgracia\AppData\Local\Temp\4rezcjn.dll' the process could not access the file because it is being used by another process'

The dll exists in that folder, permissions are correct, I have tried to close the windows session and I have opened again the Excel, but I get the same error. Does anybody faced the same problem? AX2012 R2 CU7