# Using JuMP fails

**URL:** <https://discourse.julialang.org/t/using-jump-fails/9054>\
**Category:** Optimization (Mathematical)\
**Created:** [February 14, 2018, 12:47pm UTC](https://discourse.julialang.org/t/using-jump-fails/9054 "2018-02-14T12:47:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ufechner7](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ufechner7/32/51363_2.png) [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Post date:** [February 14, 2018, 12:47pm UTC](https://discourse.julialang.org/t/using-jump-fails/9054/1 "2018-02-14T12:47:34Z")

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Hello,  
after updating my packages I get the following error:

```julia
julia> using JuMP
INFO: Precompiling module JuMP.
WARNING: Module ReverseDiffSparse with uuid 11646900819455 is missing from the cache.
This may mean module ReverseDiffSparse does not support precompilation but is imported by a module that does.
ERROR: LoadError: Declaring __precompile__ (false) is not allowed in files that are being precompiled.
Stacktrace:
 [1] _require(::Symbol) at ./loading.jl:448
 [2] require(::Symbol) at ./loading.jl:398
 [3] include_from_node1(::String) at ./loading.jl:569
 [4] include(::String) at ./sysimg.jl:14
 [5] anonymous at ./<missing>:2
while loading /home/ufechner/.julia/v0.6/JuMP/src/JuMP.jl, in expression starting on line 21
ERROR: Failed to precompile JuMP to /home/ufechner/.julia/lib/v0.6/JuMP.ji.
Stacktrace:
 [1] compilecache(::String) at ./loading.jl:703
 [2] _require(::Symbol) at ./loading.jl:490
 [3] require(::Symbol) at ./loading.jl:398

julia> 

```

Any idea?

Uwe

---

<div class="post-metadata">

**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Post date:** [February 14, 2018, 12:59pm UTC](https://discourse.julialang.org/t/using-jump-fails/9054/2 "2018-02-14T12:59:18Z")

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Restart Julia. It’s just a compilation cache error that can happen if things updating in the same session.