# Couldn't use DifferentialEquations

**URL:** <https://discourse.julialang.org/t/couldnt-use-differentialequations/18587>\
**Category:** New to Julia\
**Tags:** package\
**Created:** [December 12, 2018, 7:34am UTC](https://discourse.julialang.org/t/couldnt-use-differentialequations/18587 "2018-12-12T07:34:18Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Stephen](https://avatars.discourse-cdn.com/v4/letter/s/96bed5/32.png) [@Stephen](https://discourse.julialang.org/u/Stephen)\
**Post date:** [December 12, 2018, 7:34am UTC](https://discourse.julialang.org/t/couldnt-use-differentialequations/18587/1 "2018-12-12T07:34:18Z")

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using DifferentialEquations  
[Info: Precompiling DifferentialEquations [0c46a032-eb83-5123-abaf-570d42b7fbaa]  
ERROR: LoadError: LoadError: UndefVarError: is\_windows not defined  
Stacktrace:  
[1] top-level scope at /home/rzhli/.julia/packages/SymEngine/sh7Yz/deps/deps.jl:3  
[2] include at ./boot.jl:317 [inlined]  
[3] include\_relative(::Module, ::String) at ./loading.jl:1044  
[4] include at ./sysimg.jl:29 [inlined]  
[5] include(::String) at /home/rzhli/.julia/packages/SymEngine/sh7Yz/src/SymEngine.jl:3  
[6] top-level scope at none:0  
[7] include at ./boot.jl:317 [inlined]  
[8] include\_relative(::Module, ::String) at ./loading.jl:1044  
[9] include(::Module, ::String) at ./sysimg.jl:29  
[10] top-level scope at none:2  
[11] eval at ./boot.jl:319 [inlined]  
[12] eval(::Expr) at ./client.jl:393  
[13] top-level scope at ./none:3  
in expression starting at /home/rzhli/.julia/packages/SymEngine/sh7Yz/deps/deps.jl:2  
in expression starting at /home/rzhli/.julia/packages/SymEngine/sh7Yz/src/SymEngine.jl:26  
ERROR: LoadError: Failed to precompile SymEngine [123dc426-2d89-5057-bbad-38513e3affd8] to /home/rzhli/.julia/compiled/v1.0/SymEngine/uZhcI.ji.  
Stacktrace:  
[1] error(::String) at ./error.jl:33  
[2] macro expansion at ./logging.jl:311 [inlined]  
[3] compilecache(::Base.PkgId, ::String) at ./loading.jl:1190  
[4] \_require(::Base.PkgId) at ./logging.jl:309  
[5] require(::Base.PkgId) at ./loading.jl:858  
[6] macro expansion at ./logging.jl:309 [inlined]  
[7] require(::Module, ::Symbol) at ./loading.jl:840  
[8] include at ./boot.jl:317 [inlined]  
[9] include\_relative(::Module, ::String) at ./loading.jl:1044  
[10] include(::Module, ::String) at ./sysimg.jl:29  
[11] top-level scope at none:2  
[12] eval at ./boot.jl:319 [inlined]  
[13] eval(::Expr) at ./client.jl:393  
[14] top-level scope at ./none:3  
in expression starting at /home/rzhli/.julia/packages/ParameterizedFunctions/ozDxQ/src/ParameterizedFunctions.jl:11  
ERROR: LoadError: Failed to precompile ParameterizedFunctions [65888b18-ceab-5e60-b2b9-181511a3b968] to /home/rzhli/.julia/compiled/v1.0/ParameterizedFunctions/OKjOc.ji.  
Stacktrace:  
[1] error(::String) at ./error.jl:33  
[2] macro expansion at ./logging.jl:311 [inlined]  
[3] compilecache(::Base.PkgId, ::String) at ./loading.jl:1190  
[4] \_require(::Base.PkgId) at ./logging.jl:309  
[5] require(::Base.PkgId) at ./loading.jl:858  
[6] macro expansion at ./logging.jl:309 [inlined]  
[7] require(::Module, ::Symbol) at ./loading.jl:840  
[8] include at ./boot.jl:317 [inlined]  
[9] include\_relative(::Module, ::String) at ./loading.jl:1044  
[10] include(::Module, ::String) at ./sysimg.jl:29  
[11] top-level scope at none:2  
[12] eval at ./boot.jl:319 [inlined]  
[13] eval(::Expr) at ./client.jl:393  
[14] top-level scope at ./none:3  
in expression starting at /home/rzhli/.julia/packages/DifferentialEquations/88DSk/src/DifferentialEquations.jl:18  
ERROR: Failed to precompile DifferentialEquations [0c46a032-eb83-5123-abaf-570d42b7fbaa] to /home/rzhli/.julia/compiled/v1.0/DifferentialEquations/UQdwS.ji.  
Stacktrace:  
[1] macro expansion at ./logging.jl:311 [inlined]  
[2] compilecache(::Base.PkgId, ::String) at ./loading.jl:1190  
[3] macro expansion at ./logging.jl:309 [inlined]  
[4] \_require(::Base.PkgId) at ./loading.jl:947  
[5] require(::Base.PkgId) at ./loading.jl:858  
[6] macro expansion at ./logging.jl:309 [inlined]  
[7] require(::Module, ::Symbol) at ./loading.jl:840

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**Author:** ![fredrikekre](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/fredrikekre/32/1688_2.png) [@fredrikekre](https://discourse.julialang.org/u/fredrikekre)\
**Post date:** [December 12, 2018, 8:00am UTC](https://discourse.julialang.org/t/couldnt-use-differentialequations/18587/2 "2018-12-12T08:00:28Z")

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The error has been fixed on the master branch ([fix use of deprecated `is_windows` · symengine/SymEngine.jl@05e43fc · GitHub](https://github.com/symengine/SymEngine.jl/commit/05e43fcc97bea242e8b3eb0d214bce4ba94e49ad)), so I suggest you open an issue and request a new release of the package that will include the fix.

See also [PSA: how to quote code with backticks](https://discourse.julialang.org/t/psa-how-to-quote-code-with-backticks/7530)

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**Author:** ![Stephen](https://avatars.discourse-cdn.com/v4/letter/s/96bed5/32.png) [@Stephen](https://discourse.julialang.org/u/Stephen)\
**Post date:** [December 12, 2018, 1:41pm UTC](https://discourse.julialang.org/t/couldnt-use-differentialequations/18587/3 "2018-12-12T13:41:14Z")

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> [@fredrikekre](#):
>
> open an issue and request a new release of the package

solved， thanks