Pixhawk PSP Bash error

How do I do this?

NOTE: You may have to use C:\Windows\System32\bash.exe for downloading firmware and building within the UI, but switch to C:\Windows\Sysnative\bash.exeafter set up for running the build and downloading from a Simulink model.

More info - I downloaded the toolchain on windows 10 bash environment. Now I want to build my model. But i cannot because of the thing above.

This was taken from website https://in.mathworks.com/hardware-support/forms/pixhawk-downloads-conf.html?elqsid=1551458645150&potential_use=Student

Thankyou