Can i use PWM frequency library and use analogWrite too?

Using Arduino Programming Questions
1

Hi !
I'm new in Arduino.
I try to generate 20khz pwm on pin 9 of arduino nano by "PWM frequency library" but my program doesn't work.
I use analogWrite for pin10 too , I don't know is there any Interference 2 pwm or other timing code I use delay(), millis() and serial functions
It works properly by analogWrite on 2 pin.
Is there any solution?

2

Don't you think a link to that library would be necessary? At least my library manager in the IDE did not find it.