[support] warning: call_user_func_array() [function.call-user-func-array] error. any solution?

[crazy guru]

Dear All,

i got an error warning in my drupal site. I coulnt figure it out  and how
the error came. The error text below:

warning: call_user_func_array()
[function.call-user-func-array<http://216.106.58.94/function.call-user-func-array>]:
First argument is expected to be a valid callback, 'search_form' was given
in .......\includes\form.inc on line 366.

Whats the error and how can u solve this? I got to fix this soon. Thanks for
your support in advance.

With regards
Crazyguru
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