NonlinearProblem definition throwing UndefVarError: BVP not defined

[Shreyas-Ekanathan]

Describe the bug 🐞

When trying to initialize a NonlinearProblem, I am getting the error that:

ERROR: UndefVarError: BVProblem not defined in NonlinearSolveBase

Expected behavior

I expect no error to be thrown, and the solve proceeds as normal.

Minimal Reproducible Example 👇

using NonlinearSolve

function condition!(out, u, p)
    out[1] = u[1] - 1
    out[2] = u[1] - 2
end

uprev = [0.0, 0.0]
u     = [0.0, 0.0]
u0 = [uprev, u]
p = nothing

prob = NonlinearProblem(condition!, u0, p)
solve(prob)

Error & Stacktrace ⚠️

ERROR: UndefVarError: `BVProblem` not defined in `NonlinearSolveBase`
Suggestion: check for spelling errors or missing imports.
Hint: a global variable of this name also exists in SciMLBase.
    - Also exported by LinearSolve.
    - Also exported by NonlinearSolveFirstOrder.
    - Also exported by NonlinearSolveQuasiNewton.
    - Also exported by BracketingNonlinearSolve.
    - Also exported by SimpleNonlinearSolve.
    - Also exported by NonlinearSolveSpectralMethods.
    - Also exported by NonlinearSolve.
    - Also exported by DiffEqBase (loaded but not imported in Main).
    - Also exported by OrdinaryDiffEqCore (loaded but not imported in Main).
    - Also exported by OrdinaryDiffEqFIRK.
Stacktrace:
 [1] solve_call(::NonlinearProblem{…}; merge_callbacks::Bool, kwargshandle::Nothing, kwargs::@Kwargs{…})
   @ NonlinearSolveBase ~/.julia/packages/NonlinearSolveBase/vlUw9/src/solve.jl:151
 [2] solve_up(::NonlinearProblem{…}, ::Nothing, ::Vector{…}, ::Nothing; originator::SciMLBase.ChainRulesOriginator, kwargs::@Kwargs{…})
   @ NonlinearSolveBase ~/.julia/packages/NonlinearSolveBase/vlUw9/src/solve.jl:122
 [3] solve(::NonlinearProblem{…}; sensealg::Nothing, u0::Nothing, p::Nothing, wrap::Val{…}, verbose::NonlinearVerbosity{…}, kwargs::@Kwargs{})
   @ NonlinearSolveBase ~/.julia/packages/NonlinearSolveBase/vlUw9/src/solve.jl:93
 [4] solve(::NonlinearProblem{…})
   @ NonlinearSolveBase ~/.julia/packages/NonlinearSolveBase/vlUw9/src/solve.jl:47
 [5] top-level scope
   @ ~/Documents/GitHub/OrdinaryDiffEq.jl/lib/OrdinaryDiffEqFIRK/test/ode_firk_tests.jl:198

Environment (please complete the following information):

• Output of using Pkg; Pkg.status()

⌃ [47edcb42] ADTypes v1.18.0
⌃ [2b5f629d] DiffEqBase v6.190.2
  [7034ab61] FastBroadcast v0.3.5
  [442a2c76] FastGaussQuadrature v1.1.0
  [a4df4552] FastPower v1.2.0
⌃ [7ed4a6bd] LinearSolve v3.46.1
  [46d2c3a1] MuladdMacro v0.2.4
  [bbf590c4] OrdinaryDiffEqCore v1.34.0 `../OrdinaryDiffEqCore`
  [4302a76b] OrdinaryDiffEqDifferentiation v1.16.1 `../OrdinaryDiffEqDifferentiation`
  [127b3ac7] OrdinaryDiffEqNonlinearSolve v1.14.0 `../OrdinaryDiffEqNonlinearSolve`
  [f517fe37] Polyester v0.7.18
  [731186ca] RecursiveArrayTools v3.39.0
  [189a3867] Reexport v1.2.2
  [f2b01f46] Roots v2.2.10
⌃ [0bca4576] SciMLBase v2.124.0
⌃ [c0aeaf25] SciMLOperators v1.9.0
  [37e2e46d] LinearAlgebra v1.12.0

• Output of using Pkg; Pkg.status(; mode = PKGMODE_MANIFEST)

⌃ [47edcb42] ADTypes v1.18.0
  [7d9f7c33] Accessors v0.1.42
  [79e6a3ab] Adapt v4.4.0
  [4fba245c] ArrayInterface v7.22.0
  [4c555306] ArrayLayouts v1.12.0
  [62783981] BitTwiddlingConvenienceFunctions v0.1.6
⌃ [70df07ce] BracketingNonlinearSolve v1.5.0
  [2a0fbf3d] CPUSummary v0.2.7
  [d360d2e6] ChainRulesCore v1.26.0
  [fb6a15b2] CloseOpenIntervals v0.1.13
  [38540f10] CommonSolve v0.2.4
  [bbf7d656] CommonSubexpressions v0.3.1
  [f70d9fcc] CommonWorldInvalidations v1.0.0
  [34da2185] Compat v4.18.1
  [a33af91c] CompositionsBase v0.1.2
  [2569d6c7] ConcreteStructs v0.2.3
  [187b0558] ConstructionBase v1.6.0
  [adafc99b] CpuId v0.3.1
⌃ [864edb3b] DataStructures v0.19.2
⌃ [2b5f629d] DiffEqBase v6.190.2
  [163ba53b] DiffResults v1.1.0
  [b552c78f] DiffRules v1.15.1
⌃ [a0c0ee7d] DifferentiationInterface v0.7.10
  [ffbed154] DocStringExtensions v0.9.5
  [4e289a0a] EnumX v1.0.5
⌃ [f151be2c] EnzymeCore v0.8.15
  [e2ba6199] ExprTools v0.1.10
  [55351af7] ExproniconLite v0.10.14
  [7034ab61] FastBroadcast v0.3.5
  [9aa1b823] FastClosures v0.3.2
  [442a2c76] FastGaussQuadrature v1.1.0
  [a4df4552] FastPower v1.2.0
⌃ [1a297f60] FillArrays v1.14.0
  [6a86dc24] FiniteDiff v2.29.0
⌅ [f6369f11] ForwardDiff v1.2.2
  [069b7b12] FunctionWrappers v1.1.3
  [77dc65aa] FunctionWrappersWrappers v0.1.3
  [46192b85] GPUArraysCore v0.2.0
  [615f187c] IfElse v0.1.1
  [3587e190] InverseFunctions v0.1.17
  [92d709cd] IrrationalConstants v0.2.6
  [82899510] IteratorInterfaceExtensions v1.0.0
  [692b3bcd] JLLWrappers v1.7.1
  [ae98c720] Jieko v0.2.1
  [ba0b0d4f] Krylov v0.10.2
  [10f19ff3] LayoutPointers v0.1.17
⌃ [5078a376] LazyArrays v2.8.0
  [87fe0de2] LineSearch v0.1.4
⌃ [7ed4a6bd] LinearSolve v3.46.1
  [2ab3a3ac] LogExpFunctions v0.3.29
  [e6f89c97] LoggingExtras v1.2.0
  [1914dd2f] MacroTools v0.5.16
  [d125e4d3] ManualMemory v0.1.8
  [bb5d69b7] MaybeInplace v0.1.4
  [2e0e35c7] Moshi v0.3.7
  [46d2c3a1] MuladdMacro v0.2.4
  [77ba4419] NaNMath v1.1.3
  [8913a72c] NonlinearSolve v4.12.0
⌃ [be0214bd] NonlinearSolveBase v2.1.0
⌃ [5959db7a] NonlinearSolveFirstOrder v1.9.0
⌃ [9a2c21bd] NonlinearSolveQuasiNewton v1.10.0
⌃ [26075421] NonlinearSolveSpectralMethods v1.5.0
  [bac558e1] OrderedCollections v1.8.1
  [bbf590c4] OrdinaryDiffEqCore v1.34.0 `../OrdinaryDiffEqCore`
  [4302a76b] OrdinaryDiffEqDifferentiation v1.16.1 `../OrdinaryDiffEqDifferentiation`
  [127b3ac7] OrdinaryDiffEqNonlinearSolve v1.14.0 `../OrdinaryDiffEqNonlinearSolve`
  [f517fe37] Polyester v0.7.18
  [1d0040c9] PolyesterWeave v0.2.2
  [d236fae5] PreallocationTools v0.4.34
  [aea7be01] PrecompileTools v1.3.3
  [21216c6a] Preferences v1.5.0
  [3cdcf5f2] RecipesBase v1.3.4
  [731186ca] RecursiveArrayTools v3.39.0
  [189a3867] Reexport v1.2.2
  [ae029012] Requires v1.3.1
  [f2b01f46] Roots v2.2.10
  [7e49a35a] RuntimeGeneratedFunctions v0.5.16
  [94e857df] SIMDTypes v0.1.0
⌃ [0bca4576] SciMLBase v2.124.0
  [19f34311] SciMLJacobianOperators v0.1.11
⌃ [a6db7da4] SciMLLogging v1.3.1
⌃ [c0aeaf25] SciMLOperators v1.9.0
  [431bcebd] SciMLPublic v1.0.0
  [53ae85a6] SciMLStructures v1.7.0
  [efcf1570] Setfield v1.1.2
  [727e6d20] SimpleNonlinearSolve v2.9.0
  [ce78b400] SimpleUnPack v1.1.0
  [0a514795] SparseMatrixColorings v0.4.23
  [276daf66] SpecialFunctions v2.6.1
  [aedffcd0] Static v1.3.1
  [0d7ed370] StaticArrayInterface v1.8.0
  [90137ffa] StaticArrays v1.9.15
  [1e83bf80] StaticArraysCore v1.4.4
  [10745b16] Statistics v1.11.1
  [7792a7ef] StrideArraysCore v0.5.8
  [2efcf032] SymbolicIndexingInterface v0.3.46
  [8290d209] ThreadingUtilities v0.5.5
  [a759f4b9] TimerOutputs v0.5.29
  [781d530d] TruncatedStacktraces v1.4.0
  [3a884ed6] UnPack v1.0.2
  [1d5cc7b8] IntelOpenMP_jll v2025.2.0+0
  [856f044c] MKL_jll v2025.2.0+0
  [efe28fd5] OpenSpecFun_jll v0.5.6+0
  [1317d2d5] oneTBB_jll v2022.0.0+1
  [0dad84c5] ArgTools v1.1.2
  [56f22d72] Artifacts v1.11.0
  [2a0f44e3] Base64 v1.11.0
  [ade2ca70] Dates v1.11.0
  [8ba89e20] Distributed v1.11.0
  [f43a241f] Downloads v1.6.0
  [7b1f6079] FileWatching v1.11.0
  [9fa8497b] Future v1.11.0
  [b77e0a4c] InteractiveUtils v1.11.0
  [ac6e5ff7] JuliaSyntaxHighlighting v1.12.0
  [4af54fe1] LazyArtifacts v1.11.0
  [b27032c2] LibCURL v0.6.4
  [76f85450] LibGit2 v1.11.0
  [8f399da3] Libdl v1.11.0
  [37e2e46d] LinearAlgebra v1.12.0
  [56ddb016] Logging v1.11.0
  [d6f4376e] Markdown v1.11.0
  [ca575930] NetworkOptions v1.3.0
  [44cfe95a] Pkg v1.12.0
  [de0858da] Printf v1.11.0
  [9a3f8284] Random v1.11.0
  [ea8e919c] SHA v0.7.0
  [9e88b42a] Serialization v1.11.0
  [6462fe0b] Sockets v1.11.0
  [2f01184e] SparseArrays v1.12.0
  [f489334b] StyledStrings v1.11.0
  [fa267f1f] TOML v1.0.3
  [a4e569a6] Tar v1.10.0
  [cf7118a7] UUIDs v1.11.0
  [4ec0a83e] Unicode v1.11.0
  [e66e0078] CompilerSupportLibraries_jll v1.3.0+1
  [deac9b47] LibCURL_jll v8.11.1+1
  [e37daf67] LibGit2_jll v1.9.0+0
  [29816b5a] LibSSH2_jll v1.11.3+1
  [14a3606d] MozillaCACerts_jll v2025.5.20
  [4536629a] OpenBLAS_jll v0.3.29+0
  [05823500] OpenLibm_jll v0.8.7+0
  [458c3c95] OpenSSL_jll v3.5.1+0
  [bea87d4a] SuiteSparse_jll v7.8.3+2
  [83775a58] Zlib_jll v1.3.1+2
  [8e850b90] libblastrampoline_jll v5.15.0+0
  [8e850ede] nghttp2_jll v1.64.0+1
  [3f19e933] p7zip_jll v17.5.0+2

• Output of versioninfo()

Julia Version 1.12.1
Commit ba1e628ee49 (2025-10-17 13:02 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: macOS (arm64-apple-darwin24.0.0)
  CPU: 10 × Apple M2 Pro
  WORD_SIZE: 64
  LLVM: libLLVM-18.1.7 (ORCJIT, apple-m2)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 6 virtual cores)
Environment:
  JULIA_EDITOR = code
  JULIA_VSCODE_REPL = 1

[oscardssmith]

@jClugstor looks like this was caused by you in #669. Can you fix or should I?

[oscardssmith]

oh, is that BVProblem supposed to be IntervalNonlinearProblem?

[jClugstor]

Weird, wonder why it wasn't caught by tests...

I won't be able to look at it for a couple of hours, so if you have a quick fix go for it

[oscardssmith]

yeah, this was pretty simple. The issue was just that this was trying to account for BoundaryValueDiffEqs which don't exist within NonlinearSolve. the fix is pretty simple.