I2C Error - Remote I/O error (errno 121) with the demo pwm


I have deployed the demo /isaac/apps/samples/pwm on nano,but when I run it, an error occurred:
ERROR engine/gems/coms/i2c.cpp@106: I2C Error: Remote I/O error (errno 121)
I wander where is wrong, or how can I query the meaning of errno 121?

I have find the mistake: should attach to bus 0 (GPIO 27,GPIO 28)…
I still want to know how to query the meaning of errno xxx.

Hi lovenv, could you please provide some more info about what you did to solve this issue? What did you hook up to GPIO 27/28? Thanks.