App: Cannor read property '1' of undefined

how to correct that kind of mistake?

Thanks for reporting this issue, it’s a known issue and is being worked on. For now just ignore the message.

I noticed you have selected divertmode_state and ev_state as the feeds to be graphed. I would not recommend using a App graph to view the divert state, this feed is best viewed using Graph viewer or a dashboard, ev_state is not a kwh feed.

You want to select a power and energy feed. If you have followed the Emoncms OpenEVSE setup guide then you should have feeds called ev_power and ev_energy.

See github issue tracking this issue:

what is the function of ev_powere, ev_energy?