Question about HHT Pkg

using EmpiricalModeDecomposition
a=convert(Vector{Float64},rand(20))
s=EmpiricalModeDecomposition.EEMDSetting(2,2,2,2,2,10.0)
w=EmpiricalModeDecomposition.eemd(a,s)
EMD_heping_1MX_V_35kV1=EmpiricalModeDecomposition.hht(a,s)

I’m is to use EmpiricalModeDecomposition jl, according to the code in the document(Docstrings · EmpiricalModeDecomposition.jl) for writing, but it was an error:
ERROR: LoadError: UndefVarError: input not defined


why??thanks!

@Fliks