i would like to compile my sketch in the arduino IDE. Till yesterday the sketch still worked. But now i cannot compile my sketch. I haven't changed anything in the program.
I have copy the url:"http://arduino.esp8266.com/stable/package_esp8266com_index.json" in the presets.
This is my board: NodeMcu 12E
A picture ist in the attachment
please can you help me I did not find the right solution from the internet.