Navigate to _comprofiler_fields and find your cb_phone field. Then change its id (far left column) to the next available id after 54. This is typically just going to be whatever the next id is after the last id in your table of fields. Note any parameters or configuration linked by field id and not field name will break upon doing this, but there's not much choice as it's a non-core field using a core field id.

We'll be looking into a way to migrate this, but regardless something is going to break from doing so. It's a odd situation as it's only going to happen to previous CB 1.x installs that ran sample data. No clean CB 2.x install should hit this issue and if anyones install isn't a CB 1.x upgrade and has this issue please urgently let us know as something is wrong with the sample data tool if that's the case.

Ok, this is fixed for next minor release (we'll be doing a CB 2.1.1 soon) and in one of the build releases. You can either rollback to a backup then wait for a fixed build or apply the workaround above.

We aren't going to be using reserved ids anymore going forward and with CB 3.0 we should be hopefully complete done with reserved id usage in general. What this means is API and usages won't care what the idea is as for fields it's dependent on field name. For plugins we already almost exclusively use plugin element, but we've some work to do in that regard as fields are currently linked to their plugin by id instead of element.

Revert to a backup and install latest build. The issue has been fixed. It won't override the field using field id 54 anymore.

Would be nice if the instructions were a bit more clearer.

They're directly executed on your database in phpmyadmin. Replace jos_ with whatever the table prefix is for your database tables. This is explained below.

www.joomlapolis.com/forum/146-general/235543-6381-after-update-to-2-1-cb-phone-is-alias-field?limitstart=0#289205

Again the easiest approach is to revert to a backup and install latest build.