error when check in a page containing User field with multiple users in a custom Page Layout

Question

I have created a custom "person or group" field, added it to a content type and added the content type to my page layout.

<Field
  ID="{9B49F1A5-7FFB-400B-9B0E-0FC4D6C1417C}"
  Name="AMtalatFieldEditors"
  DisplayName="My Editors"
  Type="UserMulti"
  Mult="TRUE"
  Required="TRUE"
  ShowField="FirstName" 
  StaticName="AMtalatFieldEditors"
  SourceID="http://schemas.microsoft.com/sharepoint/v3"
  Customization=""
  UserSelectionMode="PeopleOnly"
  UserSelectionScope="0"
  Group="MyGroup"
  ShowInNewForm="TRUE">
</Field>

my content type:

  <FieldRef ID="{9B49F1A5-7FFB-400B-9B0E-0FC4D6C1417C}" Name="AMtalatFieldEditors" DisplayName="My Editors" Required="TRUE" Customization="" ShowInNewForm="TRUE"/>

and in the page layout

 <div id="editorsDiv">
            <SharePointWebControls:UserField ID="AMtalatFieldEditors" FieldName="AMtalatFieldEditors" runat="server" />
        </div>

I tried to edit the page to add users to the user field and clicked save, but it seems that the field has lost its value and is empty. Because when I click on Check In, it prompts an error and says you have to fill out all required properties, when I click on Ok it redirects me to edit properties and the field is empty. again I add the user but same error again. 

thank you very much for helping me to solve this issue, appreciate all kind of advice.

Answer 1

Can you try adding  List="UserInfo"  to your field definition?

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Dimitri Ayrapetov (MCSE: SharePoint)

Answer 2

I am facing the same problem, even with the List="UserInfo" attribute set.

Any other idea?