Question Blend Tree/Animations Not Working

Been following a tutorial online about adding animations to a Unity game and it's gotten to a point about using blend trees. As soon as I set up the tree and hit play my player character is just stuck in the idle animation, even when I hit the keys.
Other thing I notice is an error stating that 'Parameter "Hash 0" does not exist.' and that some of the animation options in the blend tree get disconnected too.

Error:
https://ibb.co/q15Tvgh

Blend Tree:

https://ibb.co/0KvVjLg
Really confused.