The IoTaWatt is encountering an exception when handling the status request. The trace indicates that it caused by something related to one of the datalogs or one of your integrations.
I can see by the two restarts that it appears the history log is trying to recover. The full datalog would probably shine some light on the cause, but it really doesn’t matter at this point.
Change the output “Cum_house_heat” to reference “House_Minisplit” rather than "House_Minisplit.pos. The I would recommend that you delete the two integrators as one does not appear to be referenced “Water_heater” and the other “House_Minisplit” should be unnecessary as the input “House_Minisplit” should be a monotonically increasing value.
Try running STATUS.
If it still takes the exception, you will need to delete the history log. Type the following command into your browser:
http://iotawatt.local/command?deletelog=history
The IoTaWatt will restart and should work OK. If not, you probably need to replace the SDcard: