DataDrivenDiffEq.jl - Package

I am new to Julia, and I am a researcher in mathematics working with the synchronization of nonlinear dynamical systems. While implementing koopman_res as in the nonlinear_forced.jl the link: for my system, its showing the error : Test threw exception
Expression: ≈(get_inputmap(koopman_res), [0, 1.0, 0.0, 0.0, 0.0], atol = 0.1)
DimensionMismatch: dimensions must match: a has dims (Base.OneTo(0), Base.OneTo(0)), b has dims (Base.OneTo(5),), mismatch at 1.

When I use println(get_inputmap(koopman_res), the result is: Matrix{Any}(undef, 0, 0)

Please do suggest identifying the dimension of the function “get_inputmap(koopman_res)”.
Thank you in advance.