This means that the primary key index in the table ezurl_object_link is not present in the main distribution while it is in your installation. You can run the given SQL sentence on you sql database to make the problem go away. This is a small issue and you can also safely ignore it.
When i execute this query " ALTER TABLE ezurl_object_link DROP INDEX PRIMARY " MySQL told me that "#1064 - Something is wrong in your syntax near 'PRIMARY' in line 1 "
What`s wrong with SQL syntax? This is a bug? What i must to do?