Line 307, Column 130: end tag for element “a” which is not open
…s/com_joomlawatch/img.php?rand=16188' border='0' alt='' title='' /></a>
If you are trying to get your Joomla site to vaidate but you get the above error you obviously have JoomlaWatch visitor tracking installed.
To get your code to validate, navigate to /modules/mod_joomlawatch_agent/ once there open the file mod_joomlawatch_agent.php in your favorate text editor.
Go down to line 87 and delete:
echo ("</a>");
Now your website should be valid… Unless you had any other errors to begin with.