Fixes

Author: ParamThakkar123

lib/OrdinaryDiffEqRosenbrock/src/rosenbrock_caches.jl

@@ -699,6 +699,7 @@ struct Rodas4ConstantCache{TF, UF, Tab, JType, WType, F, AD} <: RosenbrockConsta
     tab::Tab
     J::JType
     W::WType
+    du::rateType
     linsolve::F
     autodiff::AD
 end

lib/OrdinaryDiffEqRosenbrock/src/stiff_addsteps.jl

@@ -291,7 +291,7 @@ function _ode_addsteps!(k, t, uprev, u, dt, f, p, cache::Rodas4ConstantCache,
         always_calc_begin = false, allow_calc_end = true,
         force_calc_end = false)
     if length(k) < 2 || always_calc_begin
-        (;tf, uf) = cache
+        (;tf, uf, du) = cache
         (;A, C, gamma, c, d, H) = cache.tab
 
         # Precalculations