java.io.IOException: Error reading from /dev/i2c-1 at address 0x21 to address 0x9. Got -20001.

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    • java.io.IOException: Error reading from /dev/i2c-1 at address 0x21 to address 0x9. Got -20001. at com.pi4j.io.i2c.impl.I2CDeviceImpl.read(I2CDeviceImpl.java:221) at com.pi4j.gpio.extension.mcp.MCP23008GpioProvider$GpioStateMonitor.run(MCP23008GpioProvider.java:319)

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