Get white pop up when adding page to custom page type.

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When i create a new page type and assign handle with the same name with .php extension to it and i click the add page option what i get is just the white pop up so if any one with suggestions to it will be highly appreciable.

 
hutman replied on at Permalink Reply
hutman
Are you using 5.6 or 5.7?
Do you get any errors in your Developer Tools console?
What is the handle of the Page Type you added?