Clear variable?

I am trying to sample a Turing model with this Gibbs sampler:

sampler = Gibbs(PG(200, :toss), NUTS(.65, :a, :b, :θ, :σ, :μ, :temp))

Unfortunately, while making sure some of my code was correct, I have set a, b, \mu to some values. When I try to run this line of code, I get the error

MethodError: Cannot `convert` an object of type Float64 to an object of type Symbol

I tried setting these variables to the keyword nothing. But that didn’t help. I tried clear!(:a) but that is throwing up an error.

I’m on Julia 1.4.1. Please help, am I reading this error correctly? How do I fix it, short of closing my workspace and starting the kernel again?

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