Creating own rock-ons

Im currently working on a rock-on, and usually always get an error containging the followin message:

Lower level exception: Expecting property name:

anyone care to help sort this out?

Thanks

EDIT: error in code. found the mistake and looks like all is good

New case:

I have created json file, and installed. However repository on hub.docker.com was empty (no docker image).
Now I cannot remove the “installed” docker, nor can I change repository without creating a New JSON file.

Any ideas?

What happens if you try to remove?

I cannot remove, because rockstor has not installed the image.
so there is nothing to remove.

However, in some weird database is a reference to the installation, which blocks the port availability and changes in JSON file.