sp2013 master - the base type is not allowed for this page not registered as safe

SharePoint Asked by Adleron on December 4, 2021

I uploaded new master page via SharePoint UI and go this parse error:
rolling back to an older version get me same error.
the name of the master is nameNewMaster.master

seems like an missing key or something like that.

I reset the master to site definition which gave the ability to keep working .
but I don’t know if I can edit it.

One Answer

This can happen if you deploy a master page through a wsp. Deployed master pages are "ghosted" and will get updated automatically throughout the farm when the wsp is updated. But if the master page is then manually edited in the gallery, this will "unghost" it. The solution is to re-ghost it.

Explanation and powershell fix here:

Steps to fix through Site Settings here:

Answered by Lark Hawk on December 4, 2021

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