For the latest SDK I found BUG on Arduino IDE 1.8.5.
I have not tried any other version of IDE.
In the near future I will see whether the error is on my computer or from my IDE.
Index error: could not find referenced tool name=esptool version=0.4.6 packager=esp8266
Index error: could not find referenced tool name=xtensa-lx106-elf-gcc version=1.20.0-26-gb404fb9-2 packager=esp8266
Index error: could not find referenced tool name=mkspiffs version=0.1.2 packager=esp8266

Have you tried this already?
Sometimes you can get a compiler error that can be fixed by also installing the original ESP8266 Arduino SDK. The steps are similar. Add http://arduino.esp8266.com/stable/package_esp8266com_index.json to the Boards Manager, search for "esp8266" and install the arduino-esp8266 (latest version should be fine). For a more detailed explanation visit github.com/esp8266/Arduino.
Which OS are you using?
Install the regular esp8266 package first, it has all the tools your IDE is complaining about.
Those tools didn't exist in that version when SDK2.0.0 was released, and they haven't been added to avoid conflicts on deployment.
So far I use windows 7 ultimate 64 bit and it runs fine if using version 2.0.0.
A few moments ago I tried to use the new SDK and found the error.
What I do next:
The result still finds an error. I've done it 2 times. with the same result.
I'll try again
I'll try to replicate that, what version of the IDE are you using? Is that the one from the microsoft store?
I downloaded Arduino IDE from: https://www.arduino.cc/en/main/software
Last month when I flash my new board. which I bought on Aliexpress.
There are three types of install:
1) setup
2) zip
3) microsoft store
which one did you pick ?
Sorry, my English is bad.
I download it from SETUP
Just tried this procedure and it worked flawlessly:
So the only option left is probably in the preferences of your IDE.
Please try to apply this solution: http://forum.arduino.cc/index.php?topic=490285.0
OK thanks, I will try to follow your instructions.
Update :
Still having an error, even though I installed it with a new Arduino IDE.
I will continue my test tomorrow because now in my country is late at night
Thanks
just reproduced the error by installing the SDKs in the wrong order, I'll update the documentation accordingly.
OK the BUG issue in SDK 2.0 is finished by following the manual on the latest readme. thanks
Most helpful comment
OK the BUG issue in SDK 2.0 is finished by following the manual on the latest readme. thanks