Not able to select booleans in Unity blend tree parameters

I have been trying to make an animation play when my player is walking, it is a simple bob script for a weapon my player is holding, but when I go to my parameters in my blend tree, the boolean is not there in the drop-down menu. As you can see in the picture below, I have a boolean parameter set but only the float is shown in the drop-down.

Please help me as soon as possible.