Error getting data pnpnagios

Good afternoon,

I have Nagios Core 4.4.1 configured with PNP Nagios 06.26 and Grafana 6.01. I have configured Grafana as follows:
URL: http://localhost/pnp4nagios/
Access: Server (Default)
No options activated in authentication

The problem I have when creating a panel by selecting a host, then the service in the option label I have nothing to select (I have tried other forms of connection without success). Interestingly, only from a host if it shows me label data, but my other host (around 50) does not show me data, I would appreciate the support.

I have exactly the same problem, except for me it seems that one service works across all hosts, but all the other services dont.
I can select host and service, but when I go to select label there is nothing there.