[Plugin: Ambrosite Next/Previous Post Link Plus] Post Type Bug

I assume you are using the post_type parameter to set a custom post type. Did you remember to format the parameter value exactly as shown in the plugin instructions? If not, that would cause the error you saw. It is not a bug.

From the instructions:

The string must be formatted exactly as shown here, with each post type enclosed in double quotes, and separated by commas:

<?php next_post_link_plus( array(‘post_type’ => ‘ “post”,”event” ‘) ); ?>

I set it up that way to make it possible for people to pass multiple custom post types, as shown in the example. In fact, that is the only reason to ever use the post_type parameter, as I explain in the documentation:

The post_type parameter is intended for advanced users. 95% of the time there is no need to set this parameter; the plugin is smart enough to auto-detect custom post types and deal with them correctly. The only reason you would need to specify the post_type is if you are trying to do something weird like having posts from two different types appear in the same navigation stream.