The CometVisu add-on was not able to find your local CometVisu-client installation
Solution
If you already have a local installation of the CometVisu client you can skip step 1.
Download the latest release of the CometVisu here: CometVisu releases, extract it
and copy the 'release'-folder from the extracted archive to a local folder on your openHAB-server (e.g. /var/www/cometvisu)
Change the owner of the CometVisu-client folder to the same user you use to run openHAB, usually that is "openhab",
e.g. for linux systems:
chown -R openhab:openhab /var/www/cometvisu
Open the openHAB administration UI, goto Administration -> Settings -> Other Services -> CometVisu
and enter the absolute path to your local CometVisu client installation in the "Filesystem path" setting.
Further information:
The prerequisites for a running version of the CometVisu are:
The installed an running "CometVisu" add-on
A local installation of the CometVisu Client, the correct configured path to it and access rights for the openHAB instance
There are several reasons why this happened
You have not installed the CometVisu client on your local openHAB server yet
You do not have set the (absolute) path to your local CometVisu client in the 'userdata/config/org/openhab/cometvisu.config' file (webFolder=<absolute-path-to-your-local-cometvisu-client>)
The openHAB service has no access rights to the local CometVisu client folder