# Problem for adding new package:opening file

**URL:** <https://discourse.julialang.org/t/problem-for-adding-new-package-opening-file/67211>\
**Category:** General Usage\
**Tags:** question\
**Created:** [August 28, 2021, 9:43am UTC](https://discourse.julialang.org/t/problem-for-adding-new-package-opening-file/67211 "2021-08-28T09:43:42Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![zlq178](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/zlq178/32/17952_2.png) [@zlq178](https://discourse.julialang.org/u/zlq178)\
**Post date:** [August 28, 2021, 9:43am UTC](https://discourse.julialang.org/t/problem-for-adding-new-package-opening-file/67211/1 "2021-08-28T09:43:42Z")

</div>

I want to add a new package.But it shows me such error:

```julia

(@JuliaPro_v1.5.4-1) pkg> add DecisionTree
   Updating registry at `C:\Users\zlq\.julia\registries\General`
ERROR: SystemError: opening file "C:\\Users\\zlq\\AppData\\Local\\Temp\\jl_QkhLuvCkbs": No such file or directory
Stacktrace:
 [1] systemerror(::String, ::Int32; extrainfo::Nothing) at .\error.jl:168
 [2] #systemerror#48 at .\error.jl:167 [inlined]
 [3] systemerror at .\error.jl:167 [inlined]
 [4] open(::String; lock::Bool, read::Nothing, write::Nothing, create::Nothing, truncate::Nothing, append::Nothing) at .\iostream.jl:284
 [5] open at .\iostream.jl:273 [inlined]
 [6] open(::Pkg.Types.var"#92#93"{Dict{Base.UUID,String},SubString{String}}, ::String; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at .\io.jl:323
 [7] open at .\io.jl:323 [inlined]
 [8] pkg_server_registry_urls() at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Types.jl:954
 [9] pkg_server_registry_url at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Types.jl:932 [inlined]
 [10] update_registries(::Pkg.Types.Context, ::Array{Pkg.Types.RegistrySpec,1}; force::Bool) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Types.jl:1116
 [11] update_registries at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Types.jl:1106 [inlined] (repeats 2 times)
 [12] add(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}; preserve::Pkg.Types.PreserveLevel, platform::Pkg.BinaryPlatforms.Windows, kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:172
 [13] add(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:139
 [14] #add#21 at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:67 [inlined]
 [15] add(::Array{Pkg.Types.PackageSpec,1}) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\API.jl:67
 [16] do_cmd!(::Pkg.REPLMode.Command, ::REPL.LineEditREPL) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\REPLMode\REPLMode.jl:404
 [17] do_cmd(::REPL.LineEditREPL, ::String; do_rethrow::Bool) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\REPLMode\REPLMode.jl:382
 [18] do_cmd at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\REPLMode\REPLMode.jl:377 [inlined]
 [19] (::Pkg.REPLMode.var"#24#27"{REPL.LineEditREPL,REPL.LineEdit.Prompt})(::REPL.LineEdit.MIState, ::Base.GenericIOBuffer{Array{UInt8,1}}, ::Bool) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\REPLMode\REPLMode.jl:546
 [20] (::Atom.var"#4#15"{Pkg.REPLMode.var"#24#27"{REPL.LineEditREPL,REPL.LineEdit.Prompt}})(::REPL.LineEdit.MIState, ::Base.GenericIOBuffer{Array{UInt8,1}}, ::Bool) at C:\Users\zlq\.julia\packages\Atom\BPtI0\src\Atom.jl:31
 [21] #invokelatest#1 at .\essentials.jl:710 [inlined]
 [22] invokelatest at .\essentials.jl:709 [inlined]
 [23] run_interface(::REPL.Terminals.TextTerminal, ::REPL.LineEdit.ModalInterface, ::REPL.LineEdit.MIState) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\REPL\src\LineEdit.jl:2355
 [24] run_frontend(::REPL.LineEditREPL, ::REPL.REPLBackendRef) at C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\REPL\src\REPL.jl:1144
 [25] (::REPL.var"#38#42"{REPL.LineEditREPL,REPL.REPLBackendRef})() at .\task.jl:356

```

What’s the problem?  
What’s more, the same problem appears when I add another package,such as IJulia.jl.  
Thanks for your help!