Virtual meter errors
This page explains the known errors that can occur with virtual meters.
Error: "Invalid formula" ("Formel ungültig")
You want to create a virtual meter and receive the following error message.
- Check whether the meter you want to add is offline.

A meter that is offline looks like this in the folder structure.
If this is the case, go to the following page:
If you no longer need the offline meter, delete it and create the virtual meter again.
The problem should then be resolved.