Board Thread:General Coding Help/@comment-26923519-20170716034238/@comment-5211495-20170716105657

For Standard Edit Summary, the default page that is supposed to store the standard summaries is locked. window.dev.editSummaries = { css: '#stdSummaries { ... }',   select: 'MediaWiki:StandardEditSummary' // The page is locked }; Change it to Template:StandardEditSummary instead.