The instruction in the README doesn't work (julia-1.10.5)

[uablrek]

First:

cd /path/to/cloned/WorldDynamics.jl
julia
julia> ]add WorldDynamics
ERROR: ParseError:
# Error @ REPL[1]:1:1
]add WorldDynamics
╙ ── unexpected `]`
Stacktrace:
 [1] top-level scope
   @ none:1

That was easy to fix (but the instruction should be updated):

cd /path/to/cloned/WorldDynamics.jl
julia --project

Now the model can be used as instructed in the README (only the first time. please see below):

using WorldDynamics

but then:

World3.fig_7()
ERROR: ArgumentError: Any[dr₊pop(1900)] are either missing from the variable map or missing from the system's unknowns/parameters list.
(a *lot* of printouts omitted!)

Julia version

I am using julia-1.10.5 on Linux Ubuntu 24.04 LTS. I downloaded and unpack julia-1.10.5-linux-x86_64.tar.gz.

It is possible that the version I use (julia-1.10.5) incompatible, but then the supported Julia version should be documented. And/or preferably, the model should be updated for the latest Julia version.

Subsequent attempts

When I exit Julia and try again:

using WorldDynamics
ERROR: The following 6 direct dependencies failed to precompile:
(a lot of printouts omitted!)

This can be "fixed" by clearing ~/.julia (or $JULIA_DEPOT_PATH), but that should not be necessary.

[natema]

Thanks for flagging this, we'll look into it and let you know asap.

[aurorarossi]

When typing ] add WorldDynamics, first type ] and then add WorldDynamics.
Everything works with Julia 1.9.1. We are in the process of updating compatibility with other packages for newst Julia versions. Thank you very much!

[uablrek]

When typing ] add WorldDynamics, first type ] and then add WorldDynamics

Yes, that worked, but most (all?) people cut/paste from an instruction. And then you must also mention that you must exit the pkg-mode, which I by accident found out can be done with a backspace at the beginning of line (this is not intuitive for most people).

[uablrek]

I backed down to julia-1.9.1 but got another error:

julia> World3.fig_7()
Error showing value of type PlotlyJS.SyncPlot:
ERROR: IOError: connect: connection refused (ECONNREFUSED)
Stacktrace:
  [1] wait_connected(x::Sockets.TCPSocket)
    @ Sockets /tmp/tmp/uablrek/julia/sys/share/julia/stdlib/v1.9/Sockets/src/Sockets.jl:528
(a lot of printouts omitted!)

It looks like "something else" must be started before this can be executed(?)

[aurorarossi]

When typing ] add WorldDynamics, first type ] and then add WorldDynamics

Yes, that worked, but most (all?) people cut/paste from an instruction. And then you must also mention that you must exit the pkg-mode, which I by accident found out can be done with a backspace at the beginning of line (this is not intuitive for most people).

Yes, it is true. We will update the README.md

[aurorarossi]

I backed down to julia-1.9.1 but got another error:

julia> World3.fig_7()
Error showing value of type PlotlyJS.SyncPlot:
ERROR: IOError: connect: connection refused (ECONNREFUSED)
Stacktrace:
  [1] wait_connected(x::Sockets.TCPSocket)
    @ Sockets /tmp/tmp/uablrek/julia/sys/share/julia/stdlib/v1.9/Sockets/src/Sockets.jl:528
(a lot of printouts omitted!)

It looks like "something else" must be started before this can be executed(?)

It looks like there is a problem displaying the plot. I found a discussion with a similar problem on Ubuntu. Please check if you have these libraries installed: JuliaGizmos/Blink.jl#128

[uablrek]

I tried to set the BLINK_PORT variable to an unused port, as suggested in JuliaGizmos/Blink.jl#128 (comment), but it didn't help (same error):

export BLINK_PORT=7789

But I think you are on the right track, the problem seem very similar. I am new to Julia so I don't know howto troubleshoot Blink.

[aurorarossi]

But what about the following packages:
libgtk-3-0
libxss1
libgconf-2-4
libnss3
libasound2
libx11-xcb1
Do you have them on Ubuntu?

[uablrek]

Seems like all except libgconf-2-4 are there in one form or another. libgconf-2-4 seem to have gone out of time 😞 It seems like it can be installed on Ubuntu from ancient .deb packages, but I have got problems with upgrades after that in the past, so I don't want to do that.

I will test some newer Julia versions, I hope that will also include a Blink that can run on recent Linux distros. But if I can't get it to work, I'll leave this for now and wait for the model update.

@aurorarossi Thank you very much for your help and patience. You took time to investigate and I really appreciate that.