[00:00:00.572,937] lte_lc: Could not send AT command, error: 65536 [00:00:00.572,967] lte_lc: Could not set system mode, error: -14

I am a beginner who has just started using thingy91 DK. I am going through the devzone academy and have finished till lesson 5 and everything was working properly. When I started lesson 6 and flashed it on the thingy91 DK I got this error. I have also attached a screenshot of it.

Hoping to know what is this error and what can be done to fix it.

I am using sdk version 2.4.0 and it is on Windows 11

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