trouble uploading some photos to a gallery

Some of the photos I upload to a gallery do not work properly. The photo will be there but the photo data will not and there is a message such as following…

Warning: Illegal string offset ‘aperture’ in /home/rachelfa/public_html/wp-content/themes/tography-lite/templates/content-portfolio-single.php on line 153

Warning: Illegal string offset ‘image_meta’ in /home/rachelfa/public_html/wp-content/themes/tography-lite/templates/content-portfolio-single.php on line 156

As I said, it is only on some photos not others, and I can’t seem to figure out why.

Any suggestions?