Master Page issue : The base type is not allowed for this page. The type is not registered as safe

Hi,

Ever faced a scenario where you edited a SharePoint master page with SharePoint designer and suddenly the whole site is down with an error message

The base type is not allowed for this page. The type is not registered as safe

Well, recently i faced the same issue and fortunately there is help out there to fix and bring everything to normal. Solution is to re ghost the master page or in other words reset to site definition.

  1. Navigate to Site Settings.
  2. Under Look and feel find and navigate to Reset to site definition, and as the url suggests(_layouts/15/reghost.aspx).
  3. Paste the URL of the master page, from the master page gallery.
  4. Click reset to confirm.

Once done, the error should be gone and you site should be back up.

The email message cannot be sent .make sure the email has a valid recipient

Ever tried to send emails using CSOM using

and got an exception “The email message cannot be sent .make sure the email has a valid recipient“.

The reason is the ClientContext, you are passing to the function. Make sure the sharepoint site with which you created the Client Context has the Mail Recipient listed in the All People Group. To check that,

Navigate to [Site_Url]/_layouts/15/people.aspx?MembershipGroupId=0

and make sure the Email To user is listed in the group.

For more info Refer this .

Activate Publishing features using CSOM

After scouring through the internet and some trial and error, here it is.

You can find the GUID for the feature here .