# How to fix this Precompile error for ITensors

**URL:** <https://discourse.julialang.org/t/how-to-fix-this-precompile-error-for-itensors/112135>\
**Category:** New to Julia\
**Tags:** question, error, error-message\
**Created:** [March 26, 2024, 11:18am UTC](https://discourse.julialang.org/t/how-to-fix-this-precompile-error-for-itensors/112135 "2024-03-26T11:18:10Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![vikram\_backup](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/vikram_backup/32/202851_2.png) [@vikram\_backup](https://discourse.julialang.org/u/vikram_backup)\
**Post date:** [March 26, 2024, 11:18am UTC](https://discourse.julialang.org/t/how-to-fix-this-precompile-error-for-itensors/112135/1 "2024-03-26T11:18:10Z")

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I am getting the following error

```julia
Failed to precompile ITensors [9136182c-28ba-11e9-034c-db9fb085ebd5] to ...
ERROR: LoadError: UndefVarError: `Unwrap` not defined

```

I was adding the package Makie, OrdinaryDiffEq, DynamicalSystems

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**Author:** ![abraemer](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/abraemer/32/51403_2.png) [@abraemer](https://discourse.julialang.org/u/abraemer)\
**Post date:** [March 26, 2024, 12:35pm UTC](https://discourse.julialang.org/t/how-to-fix-this-precompile-error-for-itensors/112135/2 "2024-03-26T12:35:09Z")

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Please share the output of `versioninfo()` and `Pkg.status()`.

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<div class="post-metadata">

**Author:** ![vikram\_backup](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/vikram_backup/32/202851_2.png) [@vikram\_backup](https://discourse.julialang.org/u/vikram_backup)\
**Post date:** [March 26, 2024, 2:34pm UTC](https://discourse.julialang.org/t/how-to-fix-this-precompile-error-for-itensors/112135/3 "2024-03-26T14:34:02Z")

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```julia
julia> Pkg.status()
Status `C:\Users\vikra\.julia\environments\v1.10\Project.toml`
  [6e4b80f9] BenchmarkTools v1.5.0
  [acf6eb54] DFTK v0.6.18
  [0c46a032] DifferentialEquations v7.13.0
  [61744808] DynamicalSystems v3.3.5
  [e9467ef8] GLMakie v0.9.9
  [28b8d3ca] GR v0.73.3
  [f67ccb44] HDF5 v0.17.1
  [7073ff75] IJulia v1.24.2
⌃ [9136182c] ITensors v0.3.57
  [ee78f7c6] Makie v0.20.8
  [961ee093] ModelingToolkit v9.7.0
  [1dea7af3] OrdinaryDiffEq v6.74.1
  [ccf2f8ad] PlotThemes v3.1.0
  [91a5bcdd] Plots v1.40.2
  [c3e4b0f8] Pluto v0.19.40
  [7f904dfe] PlutoUI v0.7.58
  [6e0679c1] QuantumOptics v1.0.15
  [88a46c5d] SpinModels v0.1.0 `https://github.com/abraemer/SpinModels.jl#main`
  [90137ffa] StaticArrays v1.9.3
  [6aa20fa7] TensorOperations v4.1.0
  [2f01184e] SparseArrays v1.10.0
Info Packages marked with ⌃ have new versions available and may be upgradable.

julia> versioninfo()
Julia Version 1.10.2
Commit bd47eca2c8 (2024-03-01 10:14 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: 24 × 13th Gen Intel(R) Core(TM) i7-13700HX
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-15.0.7 (ORCJIT, goldmont)
Threads: 1 default, 0 interactive, 1 GC (on 24 virtual cores)

```

This is the output of `versioninfo()` and `Pkg.status()`.  
Can the error be ignored safely?

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<div class="post-metadata">

**Author:** ![abraemer](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/abraemer/32/51403_2.png) [@abraemer](https://discourse.julialang.org/u/abraemer)\
**Post date:** [March 26, 2024, 2:50pm UTC](https://discourse.julialang.org/t/how-to-fix-this-precompile-error-for-itensors/112135/4 "2024-03-26T14:50:09Z")

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> [@vikram\_backup](#):
>
> Can the error be ignored safely?

This I can’t say. However there was a new version of ITensors.jl released ~20h ago that changes something about Unwrap.jl. So maybe try updating and see whether the error persists.

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<div class="post-metadata">

**Author:** ![mtfishman](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mtfishman/32/30755_2.png) [@mtfishman](https://discourse.julialang.org/u/mtfishman)\
**Post date:** [March 26, 2024, 5:18pm UTC](https://discourse.julialang.org/t/how-to-fix-this-precompile-error-for-itensors/112135/5 "2024-03-26T17:18:05Z")

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Yes, please try updating your packages and see if that fixes it.