Issue with Virtual Feed visualisation

Emoncms
1

I have a bit of an issue with using Virtual Feeds.
I have the standard feed (connected to power1 on the EmonPi) which records the total consumption, and a second feed which (as of last week) records the EV consumption (connected to power2 on the EmonPi).

I’ve trying to create a virtual feed that substracts EV from total, in order to get the house consumption.
This seems to work:

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022760×468 52.4 KB

However, when I try to show a graph of that feed, I get tons of errors and no graph:

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372860×1286 987 KB

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011640×1564 328 KB

The 3 lines about missing variables occur hundreds of times before the array of value appears in the error message.

What am I doing wrong?

2

Answering my own question, for the record.
My version of emonCMS was pretty old, and the issue had already been fixed.
I had to run the update process, through the http://emonpi/emoncms/admin/view page

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