These pages are invoked by dialog actions to handle error conditions. As of this writing, two kinds of pages belong here:

• /error subpages of edit forms, invoked by do verb edit when the requested operation is not successfully completed.
• /error subpages of interactive dialog pages, invoked by do verb view when local dialog parameter local-view-error is set.

Use sort key {{#titleparts:{{PAGENAME}}||2}} in most cases, as the pagename prefix is likely either Dialog/ or Assistant/.