[Plugin: Custom Field Matrix] Using $this when not in object context

Hi!

I’m trying to make some stuff with your CF Matrix plugin but I have a problem at the moment of printing data, the error message is:

Fatal error: Using $this when not in object context in /…/public_html/wp-content/plugins/custom-field-matrix/core/api.php on line 45

I have to say that I’m searching for a solution, and one thing that could be helpful is that, specifically:

Note that you were allowed to use $this outside of classes in PHP4, but PHP5 does not allow it.

And I think that here are the problem, but I don’t have enough knowledge of your plugin to fix it, so… can you review that please?

Thanks a lot for your work and sorry for my English… :-/