Posting issues

When I try to post something, I get many repeating lines that display the following error message:

Warning: Illegal string offset ‘latitude’ in /home/content/p3nexnas06_data01/50/2082050/html/wp-content/plugins/google-seo-author-snippets/microdata_form.php on line 255

After the message the post comes in as it should normally, but obviously I don’t want the error message showing up. How can I fix/remove this?

Thank you in advance.