Arm M33 FVP - Failed to read bytes from address

Hi,

I am trying to port some Keyword spotting code that I found from: https://github.com/ARM-software/ML-KWS-for-MCU to Arm DS and have it run on an Arm M33 FVP. Although the code builds successfully without any errors, at some point I am getting the following error within a for loop :

Failed to read 4 bytes from address 0xEFFFFE6E

Failed to read 2 bytes from address 0xEFFFFFFE

I don't understand why the compiled code is trying to access memory at these addresses. I am using the default scatter file and the RAM address range is from 0x20000000 to 0x20020000.

What could I be missing?