Hi.
Is that the whole error?
Usually, when you get an error, the IDE highlights the error in the code.
In what line do you get the error?
Regards,
Sara

Hi Sara, thank you for your answer. I have reinstall everthing because I dont know why arduino doesnt tell me more about this situation. I have followed all the step in the course and i´m in page 31 with this as you can see.
I press the button of chek the sketch and the button upload, and I obtain the same error, but I dont know why because arduino doesnt tell me more. I dont know what to do Could you help me?

I have installed arduino 1.8.12 because I have 1.8.13 and I tried to know if the problem was the version of arduino, and I have the same error

I have ckeck an option in file-preference-show detailed output while compiling (it was unchecked) and I have obtain this:

Arduino:1.8.13 (Windows 10), Tarjeta:”DOIT ESP32 DEVKIT V1, 80MHz, 921600, None”

C:\Program Files (x86)\Arduino\arduino-builder -dump-prefs -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\Julio Fidalgo\Documents\Arduino\libraries -fqbn=esp32:esp32:esp32doit-devkit-v1:FlashFreq=80,UploadSpeed=921600,DebugLevel=none -vid-pid=10C4_EA60 -ide-version=10813 -build-path C:\Users\JULIOF~1\AppData\Local\Temp\arduino_build_485944 -warnings=none -build-cache C:\Users\JULIOF~1\AppData\Local\Temp\arduino_cache_499224 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.esptool_py.path=C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\tools\esptool_py\3.0.0 -prefs=runtime.tools.esptool_py-3.0.0.path=C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\tools\esptool_py\3.0.0 -prefs=runtime.tools.mkspiffs.path=C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\tools\mkspiffs\0.2.3 -prefs=runtime.tools.mkspiffs-0.2.3.path=C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\tools\mkspiffs\0.2.3 -prefs=runtime.tools.xtensa-esp32-elf-gcc.path=C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\tools\xtensa-esp32-elf-gcc\1.22.0-97-gc752ad5-5.2.0 -prefs=runtime.tools.xtensa-esp32-elf-gcc-1.22.0-97-gc752ad5-5.2.0.path=C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\tools\xtensa-esp32-elf-gcc\1.22.0-97-gc752ad5-5.2.0 -verbose C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.5\libraries\WiFi\examples\WiFiScan\WiFiScan.ino

C:\Program Files (x86)\Arduino\arduino-builder -compile -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\Julio Fidalgo\Documents\Arduino\libraries -fqbn=esp32:esp32:esp32doit-devkit-v1:FlashFreq=80,UploadSpeed=921600,DebugLevel=none -vid-pid=10C4_EA60 -ide-version=10813 -build-path C:\Users\JULIOF~1\AppData\Local\Temp\arduino_build_485944 -warnings=none -build-cache C:\Users\JULIOF~1\AppData\Local\Temp\arduino_cache_499224 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.esptool_py.path=C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\tools\esptool_py\3.0.0 -prefs=runtime.tools.esptool_py-3.0.0.path=C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\tools\esptool_py\3.0.0 -prefs=runtime.tools.mkspiffs.path=C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\tools\mkspiffs\0.2.3 -prefs=runtime.tools.mkspiffs-0.2.3.path=C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\tools\mkspiffs\0.2.3 -prefs=runtime.tools.xtensa-esp32-elf-gcc.path=C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\tools\xtensa-esp32-elf-gcc\1.22.0-97-gc752ad5-5.2.0 -prefs=runtime.tools.xtensa-esp32-elf-gcc-1.22.0-97-gc752ad5-5.2.0.path=C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\tools\xtensa-esp32-elf-gcc\1.22.0-97-gc752ad5-5.2.0 -verbose C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.5\libraries\WiFi\examples\WiFiScan\WiFiScan.ino

Using board ‘esp32doit-devkit-v1’ from platform in folder: C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.5

Using core ‘esp32’ from platform in folder: C:\Users\Julio Fidalgo\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.5

cmd /c if exist “C:\\Users\\Julio Fidalgo\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.5\\libraries\\WiFi\\examples\\WiFiScan\\partitions.csv” copy /y “C:\\Users\\Julio Fidalgo\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.5\\libraries\\WiFi\\examples\\WiFiScan\\partitions.csv” “C:\\Users\\JULIOF~1\\AppData\\Local\\Temp\\arduino_build_485944\\partitions.csv”

cmd /c if not exist “C:\\Users\\JULIOF~1\\AppData\\Local\\Temp\\arduino_build_485944\\partitions.csv” copy “C:\\Users\\Julio Fidalgo\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.5\\tools\\partitions\\default.csv” “C:\\Users\\JULIOF~1\\AppData\\Local\\Temp\\arduino_build_485944\\partitions.csv”

El sistema no puede encontrar la ruta especificada.

exit status 1

Error compilando para la tarjeta DOIT ESP32 DEVKIT V1.

Hi.
Can you try to update your ESP32 board add-on?
In your Arduino IDE, go to Tools > Boards > Boards Manager and search for ESP32.
Check if there is a new version available and update to the new version if that’s the case.
Regards,
Sara

Hi Sara, I have the last version look https://ibb.co/fGb1zNg
I´m going to use two others pcs to know if this happends there as well.

Ok PC1 and PC2 I have all installed as the course says, here I dont have any problem when I verify the sketch, but when I try to upload it I have this error

https://ibb.co/N9J88q4

Hi.
when you start seeing the dots on the debugging window, press the ESP32 on-board BOOT button.
Everything is explained here: https://randomnerdtutorials.com/solved-failed-to-connect-to-esp32-timed-out-waiting-for-packet-header/
Regards,
Sara

I think that my first problem was that my user name of windows “Julio  Fidalgo” makes the path on arduino very long and makes errors trying to find the files, because with other user that I just have created I dont have this error.
And the other error with dots, as you say Sara, was the boot button, now is working!!! thank you! 

Great!
I’ll mark this issue as resolved.
If you need further help, you just need to open a new question in our forum.
Regards,
Sara