[Plugin: WP-Gallery-Remote] Debug messages

I’m working through debug errors and notifications for the plugins I’m using. Could you please review and correct your plugin code or reply with a configuration change if this is on my end.

Notice: Use of undefined constant is_plugin – assumed ‘is_plugin’ in /home/mywayso1/public_html/.WordPress/wp-content/plugins/wp-gallery-remote/wp-gallery-remote.php on line 41

Notice: Use of undefined constant is_plugin – assumed ‘is_plugin’ in /home/mywayso1/public_html/.WordPress/wp-content/plugins/wp-gallery-remote/wp-gallery-remote.php on line 94

Notice: Undefined index: page in /home/mywayso1/public_html/.WordPress/wp-content/plugins/wp-gallery-remote/wp-gallery-remote.php on line 101

Notice: Undefined index: page in /home/mywayso1/public_html/.WordPress/wp-content/plugins/wp-gallery-remote/wp-gallery-remote.php on line 254

And this additional item when loading the main page:
Notice: Use of undefined constant parse_wpgr_tags_callback – assumed ‘parse_wpgr_tags_callback’ in /home/mywayso1/public_html/.WordPress/wp-content/plugins/wp-gallery-remote/wp-gallery-remote.php on line 164

http://wordpress.org/extend/plugins/wp-gallery-remote/