Failed compiling 'SortButton.cs':
1. 'StorageContainer' does not contain a definition for 'allowSorting' and no accessible extension method 'allowSorting' accepting a first argument of type 'StorageContainer' could be found (are you missing a using directive or an assembly reference?) [CS1061]
(SortButton 35 line 371)

Note that the server updated, I then downloaded the latest SortButton.cs, installed it, and then this error appeared