my log:
2017-08-07 21:27:05.308 Error: Could not determine data push value
2017-08-07 21:28:05.369 Error: Could not determine data push value
2017-08-07 21:29:05.427 Error: Could not determine data push value
2017-08-07 21:30:05.487 Error: Could not determine data push value
2017-08-07 21:31:05.549 Error: Could not determine data push value
2017-08-07 21:32:05.608 Error: Could not determine data push value


If i use Data Push/HTTP i have the same problem.
I send watermeter data from EspEasy:
