Some intresting problem

hi guyz, i was working on localhost. it was going well.. but suddenly an error has occured… when i try to edit or post new writing it waits long then says;

Fatal error: Maximum execution time of 30 seconds exceeded in W:\www\wp\wp-includes\class-IXR.php on line 513

pls help me guyz.. it was working allright pls help me.. thnk u!