Need help : can't upload score

Hey guys. I have a problem. I can't upload my score (herewith attached). When I try to successfully put it online, it displays a message that says :

'The score cannot be uploaded, as we don't support this version of mscz files yet.
Sorry for the inconvenience.'

I know it comes from the score itself because whenever I tried to upload another score as a guinea pig, it worked fine. Can someone help me out? What should I do to seemingly de-corrupt it and make it work again?

(Note : my version of MS is 3.2.3.7635)