call_user_func_array error nginx php 5.3.6

In logs of nginx I have following problem:
2011/04/04 13:15:05 [error] 4356#3288: *356 FastCGI sent in stderr: "PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'print_footer' not found or invalid function name in C:\www\x\wp-includes\plugin.php on line 395" while reading upstream, client: mojadresip, server: mojadomena.com, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "mojadomena.com", referrer: "mojadomena.com"
Could anybody help me out ?