php error happened

Technical information
Error type2
Error descriptionrequire_once(include/export_functions.php): failed to open stream: No such file or directory
URLwww.nadac.com/2016TopTen/2016_Breed_Top_Ten_export.php?all=1&format=excel
Error file/home/nadac1/public_html/2016TopTen/2016_Breed_Top_Ten_export.php
Error line65
SQL query

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