MQTT SyntaxError: Unexpected token Q in JSON at position 0

[HenmusZev]

Hi,
I'm new user off this nice interface. Compiling and running was al possible with the provided documentation. So far so good.
I het all the info from the from the file Altherma(ERGA E EHV-EHB-EHVZ E_EJ series 04-08kW).h but I don;t get for instance any information about A/C power consumption. But get a lot of Unexpected token Q in JSON at position 0 (see below).
What can I do to fix this?