get error in using the plugin

Hello,

I use this plugin http://wordpress.org/extend/plugins/add-linked-images-to-gallery-v01/

when i publish my post using this plugin,it shows the following errors,if there is an image from outside.How to fix it.

I used the plugin in my previous host and it worked fine.Also note that though the error message is appeared,but the imaged successfully saved in gallery.

Warning: mime_content_type() [function.mime-content-type]: Failed identify data 0:(null) in /home/pepdealc/public_html/wp-content/plugins/add-linked-images-to-gallery-v01/attach-linked-images.php on line 76

Warning: Cannot modify header information – headers already sent by (output started at /home/pepdealc/public_html/wp-content/plugins/add-linked-images-to-gallery-v01/attach-linked-images.php:76) in /home/pepdealc/public_html/wp-includes/pluggable.php on line 934

thanks