Cache control etc problem

[mosa]

From dubug I found it coming from "I18n Base" plugin. When I disable it the cache-control goes away.

Code:

Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'i18n_base_admin_pre_header' was given in /home/xxx/public_html/xxx.co.uk/admin/inc/plugin_functions.php on line 230

Anyone had this problem and how to sort it out..