java.io.IOException: Error reading from /dev/i2c-1 at address 0x21 to address 0x7. Got -30001.

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via Google Groups by Stefan Stefan, 1 year ago
Error reading from /dev/i2c-1 at address 0x21 to address 0x7. Got -30001.
via Google Groups by Milé Buurmeijer, 10 months ago
Error reading from /dev/i2c-1 at address 0x29 to address 0x1f. Got -20001.
via Google Groups by Tom Moyer, 1 month ago
Error reading from I2CDevice on I2CBus '1' ('/dev/i2c-1') at address 0x1d to address 0x2a. Got '-20001'.
via dexterindustries.com by Unknown author, 1 year ago
Error reading from /dev/i2c-1 at address 0x8 to address 0x1. Got -1.
via Stack Overflow by Developer
, 1 year ago
Error reading from /dev/i2c-1 at address 0x8 to address 0x1. Got -1.
via GitHub by twyatt
, 2 years ago
Error reading from /dev/i2c-1 at address 0x48 to address 0x1. Got -1.
java.io.IOException: Error reading from /dev/i2c-1 at address 0x21 to 
address 0x7. Got -30001.	at com.pi4j.io.i2c.impl.I2CDeviceImpl.read(I2CDeviceImpl.java:221)	at com.pi4j.gpio.extension.mcp.MCP23008GpioProvider$GpioStateMonitor.run(MCP23008GpioProvider.java:314)