Error message "Error in field 'undefined': Select a valid choice. 4 is not one of the available choices." occurs when trying to rename a KDS on the Management Console:
This occurs when trying to rename KDS on Management Console ([yoursubdomain].revelup.com) under Establishment> Kitchen Views>KDS details icon:
If you receive the above error message upon clicking Save, it's because there is a specific field that has been left blank. That field is the Sort By field under the Kitchen tab.
From the Kitchen Views page, click the Kitchen tab. Then, find the Sort By field. Click the drop-down menu and select a value. Then click Save:Now, you can edit and save the new KDS name.