Hi, today (10-April-2018) I updated Arduino AVR Boards version 1.6.21 using Board Manager. After that I got for my Arduino Nano and Arduino UNO following message after compiling an sketch and before loading: avrdude: can't open config file "C:\Users\Albnar\AppData\Local\Arduino15\packages\arduino…

Error after updating Arduino AVR boards from v1.6.20 to v1.6.21

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