Error message

• User error: ImageMagick error 1: Error: /undefined in cent Operand stack: Execution stack: %interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 2046 1 3 %oparray_pop 2045 1 3 %oparray_pop 2026 1 3 %oparray_pop 1884 1 3 %oparray_pop --nostringval-- %errorexec_pop .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- Dictionary stack: --dict:962/1684(ro)(G)-- --dict:0/20(G)-- --dict:77/200(L)-- Current allocation mode is local Current file position is 16389 GPL Ghostscript 9.26: Unrecoverable error, exit code 1 convert: no images defined `/var/www/lab/smartnet.niua.org/sites/default/files/pdfpreview/0273ba061459ec04709718a40441537b.jpg' @ error/convert.c/ConvertImageCommand/3258. in _imagemagick_convert_exec() (line 519 of /var/www/lab/smartnet.niua.org/sites/all/modules/imagemagick/imagemagick.module).
• User error: ImageMagick error 1: Error: /undefined in cent Operand stack: Execution stack: %interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 2046 1 3 %oparray_pop 2045 1 3 %oparray_pop 2026 1 3 %oparray_pop 1884 1 3 %oparray_pop --nostringval-- %errorexec_pop .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- Dictionary stack: --dict:962/1684(ro)(G)-- --dict:0/20(G)-- --dict:77/200(L)-- Current allocation mode is local Current file position is 16389 GPL Ghostscript 9.26: Unrecoverable error, exit code 1 convert: no images defined `/var/www/lab/smartnet.niua.org/sites/default/files/pdfpreview/0273ba061459ec04709718a40441537b.jpg' @ error/convert.c/ConvertImageCommand/3258. in _imagemagick_convert_exec() (line 519 of /var/www/lab/smartnet.niua.org/sites/all/modules/imagemagick/imagemagick.module).