[Plugin: Spam Free WordPress] Can't remove the plugin proberly …

Every time you come out with a new version, I’ve had troubles getting my blog to work again after upgrading!

Now I’ve given up and tried to uninstall you plugin.

No matter how hard I try to make my blog work after uninstalling it, I keep get the following warning above my comment box:

Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, ‘tl_spam_free_wordpress_comments_form’ was given in /home/xxxxx/public_html/wp-includes/plugin.php on line 403 – See more at: https://www.buildinganonline.com/blog-engage-review-consider-join-2769/

As soon as your plugin is reactivated, the above disappears.

I’ve used your plugin’s possibility to create the comment form once, but since it looked awful (at my theme), I disabled it immediately again.

I’ve tried to run the SQL query mentioned above – No luck!
I’ve tried to re-install it, and deselect all options – No luck!
I’ve deactivated all other plugin’s – No luck!

My support question is: What do I do to end this error?

https://www.ads-software.com/extend/plugins/spam-free-wordpress/