Failed to install Gurobi to Julia

[LuciaSummer]

I’m having trouble installing Gurobi 9.1. My license is up to date and the new Gurobi has been installed in the correct location. I’ve also added the correct path prior to building the package: ENV["GUROBI_HOME"] = "E:\gurobi911\win64".
However, when I put the command in Julia:

"ENV["GUROBI_HOME"] = "E:\\gurobi911\\win64"
import Pkg
Pkg.add("Gurobi")
Pkg.build("Gurobi")

Error building Gurobi would occur. Please find the error message below:

ERROR: Error building `Gurobi`: 
ERROR: LoadError: Unable to locate Gurobi installation. If the advice above did not help,
open an issue at https://github.com/jump-dev/Gurobi.jl and post the full
print-out of this diagnostic attempt.

Stacktrace:
 [1] error(s::String)
   @ Base .\error.jl:33
 [2] top-level scope
   @ ~\.julia\packages\Gurobi\Dn7m0\deps\build.jl:161
 [3] include(fname::String)
   @ Base.MainInclude .\client.jl:444
 [4] top-level scope
   @ none:5
in expression starting at C:\Users\bonnie\.julia\packages\Gurobi\Dn7m0\deps\build.jl:155

**Unable to locate Gurobi installation. Running some common diagnostics.**

Gurobi.jl only supports the following versions:

 - gurobi91
 - gurobi90

Did you download and install one of these versions from gurobi.com?
Installing Gurobi.jl via the Julia package manager is _not_ sufficient!

Found GUROBI_HOME =  E:\gurobi911\win64

Does this point to the correct install location?

We're going to look for the Gurobi library in this directory:
    E:\gurobi911\win64\bin

That directory has the following files:

 - E:\gurobi911\win64\bin\Gurobi91.NET.XML
 - E:\gurobi911\win64\bin\Gurobi91.NET.dll
 - E:\gurobi911\win64\bin\GurobiJni91.dll
 - E:\gurobi911\win64\bin\grb_ts.exe
 - E:\gurobi911\win64\bin\grbcluster.exe
 - E:\gurobi911\win64\bin\grbgetkey.exe
 - E:\gurobi911\win64\bin\grbprobe.exe
 - E:\gurobi911\win64\bin\grbtune.exe
 - E:\gurobi911\win64\bin\gurobi.bat
 - E:\gurobi911\win64\bin\gurobi91.dll
 - E:\gurobi911\win64\bin\gurobi91_light.dll
 - E:\gurobi911\win64\bin\gurobi_cl.exe
 - E:\gurobi911\win64\bin\vslauncher.exe
 - E:\gurobi911\win64\bin\vswhere.exe

We were looking for (but could not find) a file named like
`libgurobiXXX.so`, `libgurobiXXX.dylib`, or `gurobiXXX.dll`.


You should set the `GUROBI_HOME` environment variable to point to the
install location then try again. For example (updating the path to the
correct location if needed):
```
# On Windows, this might be
ENV["GUROBI_HOME"] = "C:\\Program Files\\gurobi910\\win64\\"
import Pkg
Pkg.add("Gurobi")
Pkg.build("Gurobi")

# On OSX, this might be
ENV["GUROBI_HOME"] = "/Library/gurobi910/mac64/"
import Pkg
Pkg.add("Gurobi")
Pkg.build("Gurobi")

# On Unix, this might be
ENV["GUROBI_HOME"] = "/opt/gurobi910/linux64/"
import Pkg
Pkg.add("Gurobi")
Pkg.build("Gurobi")
```
**Note: your path may differ. Check which folder you installed the Gurobi
binary in, and update the path accordingly.**

Stacktrace:
  [1] pkgerror(msg::String)
    @ Pkg.Types C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\Types.jl:55
  [2] (::Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec})()
    @ Pkg.Operations C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\Operations.jl:1040
  [3] withenv(::Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, ::Pair{String, String}, ::Vararg{Pair{String, B} where B, N} where N)
    @ Base .\env.jl:161
  [4] (::Pkg.Operations.var"#108#112"{String, Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.PackageSpec})()
    @ Pkg.Operations C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\Operations.jl:1540
  [5] with_temp_env(fn::Pkg.Operations.var"#108#112"{String, Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.PackageSpec}, temp_env::String)
    @ Pkg.Operations C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\Operations.jl:1442
  [6] (::Pkg.Operations.var"#107#111"{Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.Context, Pkg.Types.PackageSpec, String, Pkg.Types.Project, String})(tmp::String)
    @ Pkg.Operations C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\Operations.jl:1515
  [7] mktempdir(fn::Pkg.Operations.var"#107#111"{Pkg.Operations.var"#81#86"{Bool, Pkg.Types.Context, String, Pkg.Types.PackageSpec}, Pkg.Types.Context, Pkg.Types.PackageSpec, String, Pkg.Types.Project, String}, parent::String; prefix::String)
    @ Base.Filesystem .\file.jl:729
  [8] mktempdir(fn::Function, parent::String) (repeats 2 times)
    @ Base.Filesystem .\file.jl:727
  [9] sandbox(fn::Function, ctx::Pkg.Types.Context, target::Pkg.Types.PackageSpec, target_path::String, sandbox_path::String, sandbox_project_override::Pkg.Types.Project)
    @ Pkg.Operations C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\Operations.jl:1481
 [10] build_versions(ctx::Pkg.Types.Context, uuids::Vector{Base.UUID}; verbose::Bool)
    @ Pkg.Operations C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\Operations.jl:1021
 [11] build(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}, verbose::Bool)
    @ Pkg.Operations C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\Operations.jl:902
 [12] build(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}; verbose::Bool, kwargs::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
    @ Pkg.API C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:893
 [13] build
    @ C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:877 [inlined]
 [14] build(pkgs::Vector{Pkg.Types.PackageSpec}; kwargs::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
    @ Pkg.API C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:73
 [15] build
    @ C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:72 [inlined]
 [16] #build#69
    @ C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:70 [inlined]
 [17] build
    @ C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:70 [inlined]
 [18] #build#68
    @ C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:69 [inlined]
 [19] build(pkg::String)
    @ Pkg.API C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:69
 [20] top-level scope
    @ none:1

[odow]

Interesting! It certainly looks like it found it.

What is the output of

versioninfo()

import Libdl
Libdl.dlopen("E:\\gurobi911\\win64\\bin\\gurobi91.dll")

[LuciaSummer]

Here is the output:

julia> versioninfo()
Julia Version 1.6.0
Commit f9720dc2eb (2021-03-24 12:55 UTC)
Platform Info:
OS: Windows (i686-w64-mingw32)
CPU: Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz
WORD_SIZE: 32
LIBM: libopenlibm
LLVM: libLLVM-11.0.1 (ORCJIT, skylake)
Environment:
JULIA_EDITOR = "C:\Users\bonnie\AppData\Local\atom\app-1.57.0\atom.exe" -a
JULIA_NUM_THREADS = 4

julia> import Libdl

julia>

julia> Libdl.dlopen("E:\gurobi911\win64\bin\gurobi91.dll")
ERROR: could not load library "E:\gurobi911\win64\bin\gurobi91.dll"
%1 is not a valid Win32 application.
Stacktrace:
[1] dlopen(s::String, flags::UInt32; throw_error::Bool)
@ Base.Libc.Libdl .\libdl.jl:114
[2] dlopen (repeats 2 times)
@ .\libdl.jl:114 [inlined]
[3] top-level scope
@ none:1

[blegat]

Is it possible that you downloaded Gurobi 64 bit while your OS is 32 bit?

[odow]

WORD_SIZE: 32

You need to make sure you use 64-bit Julia because Gurobi doesn't support 32-bit.

Install the "64-bit (installer)" link from here: https://julialang.org/downloads/.

[LuciaSummer]

Problem solved!
Thank you so much for the help. :)