I'm unable to get my player character to move anymore (It used to work perfectly fine until today)

Basically, I’m very new to the Unreal Engine and I’m working on something involving it for my school personal project.
I managed to get my player character and game-mode to work perfectly fine since the start of the project, however today it suddenly stopped working for me. The mouse inputs still work and I can move my camera around freely, however my movement keys have suddenly gone non responsive and I am unable to resolve it.
Any help is appreciated