Unable to import design package from O365 to SharePoint On Premises - Why ?

Hello,

Recently , I have added following site columns in "Article Page" content type in O365.

And changed css for look and feel of left navigation menu.

After that, I have taken design package and tried to deploy on "On-Premise" plaform via design manager.

And I have received following error :

Feature definition with Id "XXX"  failed validation, file ListInstances\ElementsContentType.xml'The 'AllowDeletion' attribute is not declared.

Would you please tell me - whats going wrong ? is that O365 update issue ? or something I made wrong ?

Thanks and Regards,

Dipti Chhatrapati