XF 1.3 Error while updating to 1.3.0. RC1

[LordsKing]

Hello

I've got an error when I update my XenForo to 1.3.0 RC1 !
The error : http://prntscr.com/2xgcff

Actually i'm in version 1.2.5

Thanks

 

[Mike]

You have non-standard files or content in you library/XenForo directory (specifically library/XenForo/DataWriter, possibly library/XenForo/DataWriter/Page.php). This should never happen. I'd recommend that you delete library/XenForo in its entirety and reupload it.