Why 'pwm' commands does not work in the airframe script file?

Hi, I wrote following commands in the airframe script ‘13013_deltaquad’ file. But it does not work:

pwm min -d /dev/pwm_output1 -c 1 -p 1050

But if the same command is written in ‘extras.txt’ in micro sd card, it works well.

So why it does not work in the airframe script?

If micro sd card fails, it is a problem that the ‘extras.txt’ script commands are not executed any more.