Hi Yves,
I have cleared the cache again but I can get this error to appear pretty much anytime I go through the remoteInit once it has already been run once to create the sensors. If I run the remoteInit the first time (by deleting the previous install), then the error is not seen. Run the remoteInit again soon after creating the remote sensors via the remoteInit and the error shows up. I am not sure it is not still working though. Some are working. I do have a lot of sensors with the four ecobee3s (all with there own remoteInit as I mentioned previously).
I wonder if this is somehow related to running the remoteInit on a sensor that is currently used in a smart app or the SmartTiles app.