The example provided at Parameter Estimation on Highly Stiff Systems · SciMLSensitivity.jl, does not seem to be working with Optimization.jl but works fine with DiffEqFlux.sciml_train. I am getting the following error with Optimization.jl.
ERROR: MethodError: no method matching +(::Base.RefValue{Any}, ::NamedTuple{(:contents,), Tuple{Matrix{Float64}}})