Error message

User error: ImageMagick error 1: GPL Ghostscript 8.70: Unrecoverable error, exit code 1 convert: Postscript delegate failed `/var/www/buildingscience.com/htdocs/sites/default/files/migrate/pdf/BA-0602_Field_Test_Ventilation_rev2013.pdf': No such file or directory @ pdf.c/ReadPDFImage/611. convert: missing an image filename `/var/www/buildingscience.com/htdocs/sites/default/files/pdfpreview/c2ecd3c6e7353175f2e023681b92e0e5.jpg' @ convert.c/ConvertImageCommand/2800. in _imagemagick_convert_exec() (line 519 of /var/www/buildingscience.com/htdocs/sites/all/modules/imagemagick/imagemagick.module).