Check and see if you forgot the axle key when you took off the tire. That key missing is the problem if that's the case

The axle key is the square steel pin that goes in the axle slot and into the slot of the wheel - like the one shown here on my Deere X300. Usually you put the wheel on and line up the wheel and axle and then push the key in.

Yes! You guys are good. That was exactly it. I did not hear the key when it fell. It is in place now and I am back in business. Thank you!!

Glad you found it, it could have fallen off at the tire place or anywhere in between:)

I knew it was here. I saw it when I replaced the wheel, I just must not have lined it up as well as I thought...