nroselnik

I actually have the same problem, I added https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series/releases/download/0.0.7/package_heltec_esp32_index.json to the additional board. Heltec-examples shows up for a while. Afterwards, it disappeared and I received the same error.

Right, just to update. Apparently, they released version 0.08, which was auto-updated. Short-term fix: if the heltec examples did not show up in your example sketches, remove 0.08 and reinstall...