Hi I ran the following model

```
BAYESIAN_PKPD = @model begin
@param begin
tvKTV1 ~ LogNormal(log(0.4), 0.5)
tvKTV2 ~ LogNormal(log(0.1), 0.5)
tvecmo ~ Normal(-0.7, 0.5)
tvCL1 ~ LogNormal(log(0.9), 0.5)
tvCL2 ~ LogNormal(log(0.8), 0.5)
tvcircuit ~ LogNormal(log(1.2), 0.5)
tvVc1 ~ LogNormal(log(1.8), 0.25)
tvVc2 ~ LogNormal(log(3.0), 0.25)
σ_prop_1 ~ truncated(Cauchy(0, 0.4), 0, 1.0)
σ_prop_2 ~ truncated(Cauchy(0, 0.2), 0, 1.0)
σ_prop_3 ~ truncated(Cauchy(0, 0.2), 0, 1.0)
σ_add ~ truncated(Cauchy(0, 80), 0, Inf)
ω ∈ Constrained(
MvNormal(zeros(3), Diagonal([1.0,0.2,1.0])),
lower=zeros(3),
upper=fill(Inf, 3),
init=ones(3),
)
end
@random begin
ηstd ~ MvNormal(I(3))
end
@covariates WT ECMO_DAYS IS_CIRCUIT_CHANGE site T
@pre begin
# compute the η from the ηstd
# using lower Cholesky triangular matrix
η = ω .* ηstd
# PK parameters
siteeffect_1 = if site==1
σ_prop_1^2
elseif site==2
σ_prop_2^2
else
σ_prop_3^2
end
siteeffect_2 = site==2 ? σ_add^2 : 0.0
tvKTV = site == 1 ? tvKTV1 : tvKTV2*(ECMO_DAYS/6)^tvecmo
KTV = tvKTV*exp(η[1])
TVCL = site == 1 ? tvCL1 * (WT/10)^0.75 : tvCL2* (WT/10)^0.75 * tvcircuit^IS_CIRCUIT_CHANGE
CL = TVCL * exp(η[2])*(1-exp(-KTV*t))
TVVc = site == 1 ? tvVc1 * (WT/10)^1 : tvVc2 * (WT/10)^1
Vc = TVVc * exp(η[3])
end
@dynamics begin
Central' = -(CL/Vc) * Central
end
@derived begin
CP = @. Central / Vc
CONC = @. Normal(CP, sqrt(CP^2*siteeffect_1 + siteeffect_2))
end
end
param = (
tvKTV1=0.4,
tvKTV2 = 0.1,
tvecmo = -0.7,
tvCL1 = 1.0,
tvCL2 = 1.0,
tvcircuit = 1.2,
tvVc1 = 1.8,
tvVc2 = 3.6,
ω=[1.0, 0.2,1.0],
σ_prop_1=0.4,
σ_prop_2 = 0.2,
σ_prop_3 = 0.2,
σ_add = 80
)
result_PKPD = @time fit(BAYESIAN_PKPD, estimation, param, Pumas.BayesMCMC(nsamples=2000, nadapts=1000,nchains =4,target_accept = 0.6,ensemblealg = EnsembleThreads()))
```

when I try to run the following code

```
posterior_sims = simobs(
result_PKPD;
samples=200,
simulate_error=true
)
```

I get the following error

```
┌ Warning: Unrecognized keyword arguments found. Future versions will error.
│ The only allowed keyword arguments to `solve` are:
│ (:dense, :saveat, :save_idxs, :tstops, :tspan, :d_discontinuities, :save_everystep, :save_on, :save_start, :save_end, :initialize_save, :adaptive, :abstol, :reltol, :dt, :dtmax, :dtmin, :force_dtmin, :internalnorm, :controller, :gamma, :beta1, :beta2, :qmax, :qmin, :qsteady_min, :qsteady_max, :qoldinit, :failfactor, :calck, :alias_u0, :maxiters, :callback, :isoutofdomain, :unstable_check, :verbose, :merge_callbacks, :progress, :progress_steps, :progress_name, :progress_message, :timeseries_errors, :dense_errors, :weak_timeseries_errors, :weak_dense_errors, :calculate_errors, :initializealg, :alg, :save_noise, :delta, :seed, :alg_hints, :kwargshandle, :trajectories, :batch_size, :sensealg, :advance_to_tstop, :stop_at_next_tstop, :default_set, :second_time, :prob_choice)
│
│ See https://diffeq.sciml.ai/stable/basics/common_solver_opts/ for more details.
│
│ Set kwargshandle=KeywordArgError for an error message.
│ Set kwargshandle=KeywordArgSilent to ignore this message.
└ @ DiffEqBase /build/_work/PumasSystemImages/PumasSystemImages/julia_depot/packages/DiffEqBase/VN57T/src/solve.jl:835
```

Could you please let me know what does this error mean ?