B4R Tutorial ESP32 - Fix uploading sketch error problem

Temporary solution:
After you start compiling and compiling log reachs uploading sketch stage, you should continuously press BOOT button on ESP32 board until uploading complete.
Permanent solution:
Add 10uF capacitor to ESP32 board:
Positive pole to EN pin
Negative pole to GND pin
or as the following image:
capcitor.jpg
 
Top