IJulia error syntax: undefined reference in AST

General Usage
1

Suddenly when I try to start up IJulia and run any code in a Jupyter notebook or jupyter lab (e.g. just return the number 1), I get an error:

syntax: undefined reference in AST

Stacktrace:
 [1] top-level scope at In[1]:0
 [2] include_string(::Function, ::Module, ::String, ::String) at ./loading.jl:1091
 [3] execute_code(::String, ::String) at /home/mason/.julia/packages/IJulia/a1SNk/src/execute_request.jl:27
 [4] execute_request(::ZMQ.Socket, ::IJulia.Msg) at /home/mason/.julia/packages/IJulia/a1SNk/src/execute_request.jl:86
 [5] #invokelatest#1 at ./essentials.jl:710 [inlined]
 [6] invokelatest at ./essentials.jl:709 [inlined]
 [7] eventloop(::ZMQ.Socket) at /home/mason/.julia/packages/IJulia/a1SNk/src/eventloop.jl:8
 [8] (::IJulia.var"#15#18")() at ./task.jl:356

I am on a rolling release Linux distro (manjaro) so I suspect that a update to Jupyter or one of Jupyter’s dependencies broke this.

Does anyone have advice to help me diagnose this issue? I’d really appreciate the help. I tried updating IJulia, running build IJulia, deleting and reinstalling IJulia, etc.

2

Hm, I managed to uninstall Jupyter from my machine and then reinstalling IJulia.jl prompted me to install Jupyter via Conda.

Unfortunately, the error did not go away.

3

Upgraded to 1.5.3 this afternoon. Tried IJulia when I saw this post and had no problems.

Running 1.5.3 on a Mac with the latest OS.

4

Yeah, I got this error on 1.5.2. This is unrelated to the julia version. I have upgraded to 1.5.3 and that has also not fixed the issue.

5

Opened an issue: https://github.com/JuliaLang/IJulia.jl/issues/960

1 Like
6

This solved it for me:

  1. Close all Julia sessions
  2. Remove all content of ~/.julia/packages/IJulia/ and ~/.julia/compiled/v1.5/IJulia/
  3. In REPL of v1.5.3:
using Pkg
Pkg.add(Pkg.PackageSpec(;name="IJulia", version="1.21.3"))
  1. Launch Jupyter, it should work now.
2 Likes
7

That did it, thanks!