I'm currently using impact-dev-server to run Weltmeister.
(https://github.com/drhayes/impact-dev-server)
No problem with adding layer, locating tiles and entities so on.
But on saving it keeps showing the error wrtten below.

Error: No Data or Path specified

I've been searching for an hour to solve this problem at forum.
But it seems that nobody has proper solution for this.
I try no to install MAMP because I had seriously problem before using it.

The most weird thing is that it shows the files at the location of the path inserted.
For example I made an emtpy js file which is main.js on /lib/game/levels.
Welt does show the file and I selected it. And then show the same error again.

I'd appreciate if someone fixes this problem.
I purchased impact.js licences a few months ago but couldn't even make Pong game as Hello World.

Thanks in advance.