Error:
Page contains property "blogid" which is not part of the schema.
Page contains property "postid" which is not part of the schema.
These are common errors returned when Bloggers test their markup with Google's Schema Testing Tool. These properties, blogId and postId are not recognized as schema properties. However these errors may not cause any issue for displaying Rich Snippets.
Easy Fix 1 - Blogger BlogId and PostId Structured Data Errors
World's first AMP Blogger