RegisterUpdater - definition does not exist

[Anonymous]

Hello,

I have problem with (un)registering updater for DMU. I just followed basic sample 

        WallUpdater updater = new WallUpdater(a.ActiveAddInId);
            UpdaterRegistry.RegisterUpdater(updater);

but "RegisterUpdater" is underlined red for error and says " 'UpdaterRegistry' does not contain a definition for 'RegisterUpdater' " , definition "AddTriger" exist but this one doesn't.

Is something changed or am i doing smth worng?

I am using code for Revit 2017

Thanks,

Igor

[matthew_taylor]

Looks okay to me. Namespace overlap?