Same problem as the last user. I created a thread about this but I don't know if I should delete it now.
I recently started to have a problem with the Docker plugin. I want to change the location of the docker base path in the plugin, however if I specify a folder that's in a different hard drive (Anything that's not the OS hard drive) I get this message.
exception 'OMV\Rpc\Exception' with message 'Failed to decode JSON string: No error' in /usr/share/php/openmediavault/rpc/rpc.inc:184
#0 /usr/share/php/openmediavault/rpc/proxy/json.inc(95): OMV\Rpc\Rpc::call('Docker', 'setSettings', Array, Array, 3)
#1 /var/www/openmediavault/rpc.php(45): OMV\Rpc\Proxy\Json->handle()
I'm not really sure of what's going on, hopefully you will be able to help me.