When you are using Skyline you get a Server Error in '/' Application message stating:
"Could not allocate space for object 'dbo.BasketItem'.'PK_BasketItem' in database 'Skyline' because the 'PRIMARY' filegroup is full. Create disk space by deleting unneeded files, dropping objects in the filegroup, adding additional files to the filegroup, or setting autogrowth on for existing files in the filegroup"
Your Skyline database is full and needs to be cleared. Files need to be deleted to create some space. Contact Skyline support who will arrange to purge your database. It is likely to take a few hours, depending on the size of your databases.