Cannot complete command because the extension could not be loaded.

Hello.

I'm trying to make a simple HTML5 base panel (just empty, with a simple click) for Photoshop. But I have a problem I can not solve.

I do everything according to the article

http://www.adobe.com/devnet/creativesuite/articles/a-short-guide-to-HTML5-extensions.html

Besides, I used someone else's blank panel

https://github.com/marekhrabe/photoshop-html-panel

In both cases, I get an error. When I try to open the newly created panel in Photoshop, I get the message

"Cannot complete command because the extension could not be loaded."

What am I doing wrong?

Help me please.

Mac OS 10.9.2, Photoshop CC