when uninstall import_content for J1.5, I got the below error.

* JInstaller::install: SQL Error. DB function failed with error number 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICU' at line 1 SQL=without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. #
SQL =

without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#

* Component Uninstall: SQL error or missing or unreadable SQL file. DB function failed with error number 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICU' at line 1 SQL=without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. #
SQL =

without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#

This is a known issue and has no affect on the uninstall process.
It will be fixed in the next release.

For anyone that wishes to fix it before then in Export Content version 1.7.0 go to:
/administrator/components/com_export_content/new_version/ uninstall.mysql.utf.sql

And replace the text that is there with this:

Code:

/* # @package Export Content # @copyright Copyright (C) 2008 www.bestdownloadsites.com All rights reserved. # @license http://www.gnu.org/copyleft/gpl.html GNU/GPL, # Export Content is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # */

And save. Next time any data is compiled for Joomla1.5+, installed and then uninstalled there should be no error message.