# Juno refuses to calculate anything (REPL ok)

**URL:** <https://discourse.julialang.org/t/juno-refuses-to-calculate-anything-repl-ok/10240>\
**Category:** Juno\
**Created:** [April 9, 2018, 9:38am UTC](https://discourse.julialang.org/t/juno-refuses-to-calculate-anything-repl-ok/10240 "2018-04-09T09:38:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Torkel](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/torkel/32/5030_2.png) [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Post date:** [April 9, 2018, 9:38am UTC](https://discourse.julialang.org/t/juno-refuses-to-calculate-anything-repl-ok/10240/1 "2018-04-09T09:38:53Z")

</div>

This have happened the last few days, I have tried restarting Juno without any change.

After starting Atom I click enter in the REPL to start Julia and get this printed:

```julia
Press Enter to start Julia.
               _
   _ _ _(_)_ | A fresh approach to technical computing
  (_) | (_) (_) | Documentation: https://docs.julialang.org
   _ _ _| |_ __ _ | Type "?help" for help.
  | | | | | | |/ _` | |
  | | |_| | | | (_| | | Version 0.6.2 (2017-12-13 18:08 UTC)
 _/ |\ __'_|_|_|\__'_| | Official http://julialang.org/ release
|__/ | x86_64-pc-linux-gnu

ERROR: Invalid history file (/home/Torkel.Loman/.julia_history) format:
If you have a history file left over from an older version of Julia,
try renaming or deleting it.
Invalid character: '1' at line 1
Stacktrace:
 [1] hist_from_file(::Base.REPL.REPLHistoryProvider, ::IOStream, ::String) at ./REPL.jl:352
 [2] #setup_interface#23(::Bool, ::Array{Dict{Any,Any},1}, ::Function, ::Base.REPL.LineEditREPL) at ./REPL.jl:771
 [3] run_frontend(::Base.REPL.LineEditREPL, ::Base.REPL.REPLBackendRef) at ./REPL.jl:940
 [4] run_repl(::Base.REPL.LineEditREPL, ::Base.##510#511) at ./REPL.jl:180
 [5] _start() at ./client.jl:413

```

In addition this red error message appears in the upper right corner of Juno

```julia
Julia Client – Internal Error

UndefRefError: access to undefined reference
changeREPLmodule(::String) at repl.jl:99
(::Atom.##139#140)(::Dict{String,Any}) at repl.jl:27
handlemsg(::String, ::Dict{String,Any}, ::Vararg{Dict{String,Any},N} where N) at comm.jl:163
(::Atom.##11#13)() at event.jl:73

```

I have seen these kind of errors before and haven’t really cared since everything worked fine. Now how ever, things are not working fine. I can use the REPL as normal. However, if I try to execute anything in the files above (like `1+1`) using Shift+Enter the cogs appear to the right of the line, but stays there forever. Basically I can only use the REPL and the things I try to execute in the files do not work (this is not good).

Is this a know issue, might the error messages have anything to do with it?

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<div class="post-metadata">

**Author:** ![pfitzseb](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/pfitzseb/32/45566_2.png) [@pfitzseb](https://discourse.julialang.org/u/pfitzseb)\
**Post date:** [April 9, 2018, 9:54am UTC](https://discourse.julialang.org/t/juno-refuses-to-calculate-anything-repl-ok/10240/2 "2018-04-09T09:54:16Z")

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As the error message says, try renaming or deleting `/home/Torkel.Loman/.julia_history`. Also try `Pkg.update()`ing and updaing the Atom packages `julia-client` and `ink`. If that doesn’t work, can you provide the output of `Pkg.status()`?

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<div class="post-metadata">

**Author:** ![Torkel](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/torkel/32/5030_2.png) [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Post date:** [April 9, 2018, 10:32am UTC](https://discourse.julialang.org/t/juno-refuses-to-calculate-anything-repl-ok/10240/3 "2018-04-09T10:32:18Z")

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Thank you for the help! Deleting the history file did not fix the issue (but did remove those irritating error messages).

However, updating `julia-client` and `ink` did work, cheers.