Restart hyperion with different json configuration

Hi,

I would like to be able to switch between different json configuration files.
When I try it I always end up with the error of "JSONSERVER ERROR: could not bind to port".
If I try different port, then it end up in a mess of different "servers".

Every file that is executed is some kind of this file:

#!/bin/sh
sudo systemctl stop hyperion.service 2>/dev/null
sleep 1
kodi-send -a "Notification(Hyperion Info,Ambilight für TV aktiviert,7000,http://powerpi.de/wp-content/uploads/powerpi/powerpi_ambi_thumb_kodi.jpg)"
sudo /usr/bin/hyperiond /etc/hyperion/hyperion.config.tv.json
</dev/null >/dev/null 2>&1 &

I get further,

but now I can't start an instance with external grabber (logilink). I receive this error:

terminate called after throwing an instance of 'std::runtime_error'
  what():  V4L2GRABBER ERROR: Cannot identify '/dev/video0' ERROR 2, No such file or directory

Hiw can I check if my external grabber is working.
In the past days I have managed to start the external grabber, so it is already proven that it works.

OK I solved it. I changed the usb slot and video0 was recognized.
If having same issue as myself, than just try ls /dev and see if video0 is listed. If not than just switch usb slot for the grabber and check again.