User Profile Photo upload

Hello All - I am trying to upload the picture of the selected user using webpart following http://nishantrana.me/2013/12/18/upload-user-profile-picture-programmatically-in-sharepoint-2013/ article. I am executing with elevated privilege (Farm Admin) still it is throwing error that "Site has not been shared with you" on

SPFolder subfolderForPictures = web.Folders["User Photos"].SubFolders["Profile Pictures"];

I checked that Admin has permission on "Profile Pictures" folder and "User Photos" library as well as on mysite.

Could anybody please guide me? 

Regards,

Khushi