Can't compile ESP32 (Arduino IDE 1.8.5 + Library 2.9.1)

Hi! This is Victor.
After testing my ESP32 with Arduino IDE 1.8.5 with some other platforms, I’ve decided to try Thinger-io.

Just simply trying to compile the example ( for ESP32) a bit modified as I have indicated about pins, etc, but I got always this error message while compiling (see attached JPG pic


I’m really wishing to try Thinger-io as another excellent platform I’ve tried only always to 8 fields (maximum) while I’d need, at least, 12 fields for data.

Thank you in advance for any help on this!