Tello error No valid imu / Motor stop

Hi! Today when I tried to run my working Python file, the Tello flipped over after takeoff. I say it’s working because it worked the last time I ran it, everything was fine. This time however, the Tello did not get off the ground, and the code output showed errors. What does “No valid imu” and “Motor stop” mean? I have searched for similar issues - the propellers are installed correctly, the motors should be working (they were working, and I haven’t messed around with anything), and I am in a well lit room. What could be causing this issue? There isn’t anything wrong in my code, and this just started happening today. The drone was not damaged at all since the last time it flew. A bit worried as we near the competition date.

[INFO] tello.py - 129 - Tello instance was initialized. Host: '192.168.10.1'. Port: '8889'.
[INFO] tello.py - 438 - Send command: 'command'
[INFO] tello.py - 462 - Response command: 'ok'
[INFO] tello.py - 438 - Send command: 'battery?'
[INFO] tello.py - 462 - Response battery?: '81'
[INFO] tello.py - 438 - Send command: 'battery?'
[INFO] tello.py - 462 - Response battery?: '81'
[INFO] tello.py - 438 - Send command: 'takeoff'
[INFO] tello.py - 462 - Response takeoff: 'ok'
[INFO] tello.py - 438 - Send command: 'forward 20'
[INFO] tello.py - 462 - Response forward 20: 'error No valid imu'
[INFO] tello.py - 438 - Send command: 'forward 20'
[INFO] tello.py - 462 - Response forward 20: 'error Motor stop'
[INFO] tello.py - 438 - Send command: 'forward 20'
[INFO] tello.py - 462 - Response forward 20: 'error Motor stop'
Traceback (most recent call last):
File "path\Bell AVR 23-24\Tello\tests.py", line 2, in <module>
tello.move_forward(20)
File "path\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\djitellopy\enforce_types.py", line 54, in wrapper
return func(*args, **kwargs)
File "path\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\djitellopy\tello.py", line 656, in move_forward
self.move("forward", x)
File "path\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\djitellopy\enforce_types.py", line 54, in wrapper
return func(*args, **kwargs)
File "path\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\djitellopy\tello.py", line 621, in move
self.send_control_command("{} {}".format(direction, x))
File "path\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\djitellopy\enforce_types.py", line 54, in wrapper
return func(*args, **kwargs)
File "path\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\djitellopy\tello.py", line 487, in send_control_command
self.raise_result_error(command, response)
File "path\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\djitellopy\enforce_types.py", line 54, in wrapper
return func(*args, **kwargs)
File "path\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\djitellopy\tello.py", line 529, in raise_result_error raise TelloException("Command '{}' was unsuccessful for {} tries. Latest response:\t'{}'" djitellopy.tello.TelloException: Command 'forward 20' was unsuccessful for 4 tries. Latest response: 'error Motor stop'
[INFO] tello.py - 438 - Send command: 'land'

path is C:\Users\{user}

Some of our propellers were on the wrong motor, we fixed it and it worked.