Issue with register function method in library

[DurbanVisuals]

Thanks for this first of all. But I am getting this error when calling the method to add a custom function:

Message: Argument 2 passed to Twig::register_function() must implement interface Twig_FunctionInterface, none given,

And I was calling something like this $this->twig->register_function('test', $template);

[bmatschullat]

Would u add u're function liked https://github.com/bmatschullat/Twig-Codeigniter/blob/master/application/libraries/Twig.php#L156 ??

[DurbanVisuals]

No I was trying to load a custom function to my Class, should I register a function with CI first then pass to your method? The other registered functions work great just haven't had success with anything custom / not in CI

[bmatschullat]

it was only nesasary that the first parameter of addFunction was a string and the second one was something like "new Twig_Function_Function('YOUR_FUNCTION_NAME')