Board d1_mini (platform esp8266, package esp8266) is unknown after upgrade to 2.4.0-rc2

[reibuehl]

Basic Infos

Hardware

Hardware: ESP8266
Core Version: 2.4.0-rc2

Description

I upgraded to 2.4.0-rc2 to get the KRACK fix by replacing the URL in Arduino IDE preferences and installing it via Boardmanager. If I try to recompile, I now get the error:

Board d1_mini (platform esp8266, package esp8266) is unknown

Error compiling for board WeMos D1 R2 & mini.

Settings in IDE

Module: WeMos D1 R2 & mini
Flash Size: 4MB
CPU Frequency: 80Mhz

[reibuehl]

After deleting the folder "packages" under \Users<login>\AppData\Local\Arduino15 and then reinstalling all previously installed board packages via the Board Manager, the error is gone.

[Tussini69]

I had the same issue. Solved it works now. Thanks!!

[afortiori85]

Same issue here, and this worked for me. Thank you!

[Nikospax]

Thanks works for me.

[wlraider70]

You fixed it.