Hello Lawrence,

Based on the error that you have posted here, it looks like your blog post is actually created by a "guest" user and not a valid user on your Joomla site. How was the post generated ? I can't really troubleshoot this unless I take a look at the site and debug it. However, I do think that the problem is probably the author of the user.

Hi,
I have migrated all users, articles and categories form old database to new database form default articles to easyblog..
After migration m getting this type of error..Listing page and category pages are working file..problem getting in detail page

Hello,

Can you provide us your backend and FTP access so we can have a better look on your issue here? Seems like the user is not a Joomla user. We need to identify which blog post that causing this issue. Please advise.