Can't create thumbs in back-end or front end

beez

I'm using 1.2.6 and when I tries to view picture in the gallery (by using the copy image link) I'm getting this error:
Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: gd-jpeg: JPEG library reports unrecoverable error: in /home/wowowse/public_html/mf/photos/zp-core/lib-GD.php on line 30

Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: '/home/wowowse/public_html/mf/photos/albums/testalbum/Sebastian_CL.jpg' is not a valid JPEG file in /home/wowowse/public_html/mf/photos/zp-core/lib-GD.php on line 30

Warning: filemtime() [function.filemtime]: stat failed for /home/wowowse/public_html/mf/photos/cache//testalbum/Sebastian_CL.jpg_595.jpg in /home/wowowse/public_html/mf/photos/zp-core/i.php on line 195

Warning: Cannot modify header information - headers already sent by (output started at /home/wowowse/public_html/mf/photos/zp-core/lib-GD.php:30) in /home/wowowse/public_html/mf/photos/zp-core/i.php on line 199

Warning: Cannot modify header information - headers already sent by (output started at /home/wowowse/public_html/mf/photos/zp-core/lib-GD.php:30) in /home/wowowse/public_html/mf/photos/zp-core/i.php on line 216

Warning: Cannot modify header information - headers already sent by (output started at /home/wowowse/public_html/mf/photos/zp-core/lib-GD.php:30) in /home/wowowse/public_html/mf/photos/zp-core/i.php on line 217

acrylian

Check the image that is mentioned in the error quite obviously. It might be corrupt. Also try a clean reinstall maybe.