Using the new Arduino IDE for ESP8266 and found bugs, report them here

Moderator: igrr

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By jsmwrench
#91303 I'm not sure if this will help everyone, but I was having the same issue (3 nano's, 2 NodeMCU's, and 1 Uno). I read a lot of different advice about how some pins being "pulled up" or "down" can interfere with uploading sketches, so I decided to remove ALL connections from my board except the USB and power/ground wires. In other words, any pin other than power or ground should be disconnected from any peripheral. Upload your sketch and after upload is complete and your board has reset, then plug in all of the peripherals. I did this and my sketch uploaded without any issues.

I hope this helps someone.