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Hello,
I'm stuck at the build step from teh IoT fundamentals course as when I try to build I get the next error:

It seems that the build needs two (samples/cellular/nrf91_crypto_partitions.dtsi or the .dtsi workaround files) which aren't on the dts folder. I've checked the folder and to my surprise the folder does not contain the sub-folders specified.
I've tried to solve this problem with the AI assistant but the solutions were unsuccessful.
Regards.