^^ This is what @BambOoxX is referring to. There are exactly two google hits on that error message; the “solution” to this topic and the un-answered "None Sym BasicSymbolic doesn't have a name" Problem when using NeuralPDE. Let’s take the discussion here to the latter.
@BambOoxX if you could post the complete error message (including stack trace) and package versions there, that’d be great!