Error + msSHPopenFile() + msBuildPath()

[raffle peter]

Hi
     I am trying query by point in PHP/Mapscript, but i am getting an error, msSHPopenFile: No(NULL) file name provided in /usr/local/apache/test/my.inc.php in line number 488 and msBuildPath: in /usr/local/apache/test/my.inc.php. I am using mapserver 4.8. Can any one point me why is the error?
  Thanks
  Raffle

		
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