Error saving the configuration

Trying to save the configuration, I’m getting the following error:

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘string’ not found or invalid function name in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php on line 235

Warning: Cannot modify header information – headers already sent by (output started at /home/storage/0/e8/29/nicioli1/public_html/wp-includes/plugin.php:235) in /home/storage/0/e8/29/nicioli1/public_html/wp-includes/pluggable.php on line 1167

The page I need help with: [log in to see the link]