You are using function print_filters_for() from stackoverflow.com in your plugin. As I have already added this function in my functions.php, this results in a fatal error.
If needed in the plugin anyway, you should enclose this function definition in a
if(!function_exists("print_filters_for")) ... to avoid conflicts with other code or rename it to a more unique name.
This plugin looks promising and I just begin to test it. Hope it will work fine.