Arduino says a subfolder of your sketchbook is not a valid library
When im trying to add I2Cdevlib as a .ZIP library arduino says a subfolder of your sketchbook is not a valid library
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When im trying to add I2Cdevlib as a .ZIP library arduino says a subfolder of your sketchbook is not a valid library
They are warnings not errors. If you can see the memory percentage, then the compiling is done.