Warning Messages

Hi,

After activate the plugin & reflush permalinks I get this warning message every time I try to add a new (Test) Custom taxonomy Term:

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'remove_taxonomy_base_slug_flush_rules_action' not found or invalid function name in www.domain.com/wp-includes/plugin.php on line 406

Warning: Cannot modify header information - headers already sent by (output started at www.domain.com/wp-includes/plugin.php:406) in www.domain.com/wp-includes/class-wp-ajax-response.php on line 129
Select TestTest
test0]]>Select TestTest
test0]]>

If then I clikc on the Taxonomy leftbar menu link the new Term shows up. But if I open to edit and try to save the changes I get this message:

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'remove_taxonomy_base_slug_flush_rules_action' not found or invalid function name in www.domain.com/wp-includes/plugin.php on line 406

Warning: Cannot modify header information - headers already sent by (output started at www.domain.com/wp-includes/plugin.php:406) in www.domain.com/wp-includes/pluggable.php on line 875

Any idea why is happend?

The terms save the changes but every time shows this messages. SO I had to deactivate the plugin to add new terms and edit them without those message.

Thanx for any help.

http://wordpress.org/plugins/remove-taxonomy-base-slug/