SharePoint 2013/2010 - Model Dialog errors out when you use Site Pages
Issue
When you try to include a page from Site Page library in a Model Dialog box, SharePoint gives error with query parameter &IsDlg=1 and if you open the same page in normal browser without &IsDlg=1 , then it works fine.
Resolution
SharePoint model pop will look for the webpart layout in the model pop page and the Site Pages are made of wiki layout, it fails. Try creating the page in the Pages Library with webpart layout and use in the model dialog, then it will work fine.
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