I suppoe the problem is with a leftover page draft. So the draft couldn`t find its master and it returned the error.
To fix at your end (please do a quick test at a backup project).
1.Crete .aspx page in solution
2. In the Page_LoadMethod paste this.
var pageManager = PageManager.GetManager();
var draftPages = pageManager.GetDrafts<PageDraft>().Where(p => p.TemplateId ==
) && p.IsTempDraft ==
var dummy = draftPages.FirstOrDefault();
var id =
(draftPage.Id != id)
An explanation :
)I took random template_id from page_data table
var id =
); this is the guidID from the error thrown when getting the problem (in your screenshot the error is 986d....). It is the same as in your error so you can just run the code directly without changing it.
3. Runthe aspx page in the browser or in debug
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