Hello, I have this error in pmu, could someone tell me what it is?
There is no error on the screen you provided — it is just information that one of the outputs is active.
Please share your project and the log file from the moment when you observed the fault.
How do I know which of the inputs is active?
How can I know which of the outputs is active?
I strongly encourage you to read the PMU user manual:
In the screenshot that you posted, there is a visible graph log with the channel pmu.outActiveMask, which indicates which of the outputs is active.