Error FileStorage.server.Store

Hello.
One of my plugins stopped working with the following error:

No overload for method 'Store' takes 3 arguments

And here’s the line it’s complaining about:

var crc32 = FileStorage.server.Store(www.bytes, FileStorage.Type.png, CommunityEntity.ServerInstance.net.ID).ToString()

I tried to find a solution to the problem on my own, but to no avail.
The error appeared after the latest update.

Contact the plugin develiper. What plugin is it?