I have recently updated my site to 7.4.2 and when I try to to access Admin>Languages it says

Error: Languages is currently unavailable. DotNetNuke.Services.Exceptions.ModuleLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Modules.Admin.Languages.LanguageEnabler.OnLoad(EventArgs e) --- End of inner exception stack trace ---