Unable to find template renderer to handle file extension .vm

[NoahH]

Hi!

I'am struggled with the following trouble.

I'am using Confluence 6.1.2 (7430) / Atlassian SDK 6.2.11 / FastDev disabled / Dev Toolbox 2.0.17 for developing plugin.

I'am trying to implement Admin config page. In my servlet I've injected TemplateRender renderer object.

But the signature of the merhod renderer.render differs from the docs. It states that there are minimum 3 arguments, like (string s1, string s2, Map) and return value is Streamable interface. From what I can understand, the first argument must be a key of a plugin, second is the path to *.vm template file, and the third is a context object.

And unfortunatelly, I get the following error when I hit the configuration endpoint.

I urgently need that feature to use 

<meta name="decorator" content="atl.admin">

 decorator. But I cannot manage why this is not working.