Interact v0.9.0 doesn't work with Jupyter Lab 0.33.7

[roberthoenig]

[1]: using Interact

KERNEL EXCEPTION
KeyError: key "command" not found

Stacktrace:
 [1] getindex at ./dict.jl:478 [inlined]
 [2] dispatch(::WebIO.IJuliaConnection, ::Dict{String,Any}) at /home/robert/.julia/packages/WebIO/WN6vl/src/connection.jl:22
 [3] (::getfield(WebIO, Symbol("##73#74")){WebIO.IJuliaConnection})(::IJulia.Msg) at /home/robert/.julia/packages/WebIO/WN6vl/src/providers/ijulia.jl:56
 [4] comm_msg(::ZMQ.Socket, ::IJulia.Msg) at /home/robert/.julia/packages/IJulia/iMVN2/src/comm_manager.jl:134
 [5] #invokelatest#1 at ./essentials.jl:686 [inlined]
 [6] invokelatest at ./essentials.jl:685 [inlined]
 [7] eventloop(::ZMQ.Socket) at /home/robert/.julia/packages/IJulia/iMVN2/src/eventloop.jl:8
 [8] (::getfield(IJulia, Symbol("##15#18")))() at ./task.jl:259
KERNEL EXCEPTION
KeyError: key "command" not found

Stacktrace:
 [1] getindex at ./dict.jl:478 [inlined]
 [2] dispatch(::WebIO.IJuliaConnection, ::Dict{String,Any}) at /home/robert/.julia/packages/WebIO/WN6vl/src/connection.jl:22
 [3] (::getfield(WebIO, Symbol("##73#74")){WebIO.IJuliaConnection})(::IJulia.Msg) at /home/robert/.julia/packages/WebIO/WN6vl/src/providers/ijulia.jl:56
 [4] comm_msg(::ZMQ.Socket, ::IJulia.Msg) at /home/robert/.julia/packages/IJulia/iMVN2/src/comm_manager.jl:134
 [5] #invokelatest#1 at ./essentials.jl:686 [inlined]
 [6] invokelatest at ./essentials.jl:685 [inlined]
 [7] eventloop(::ZMQ.Socket) at /home/robert/.julia/packages/IJulia/iMVN2/src/eventloop.jl:8
 [8] (::getfield(IJulia, Symbol("##15#18")))() at ./task.jl:259
KERNEL EXCEPTION
KeyError: key "command" not found

Stacktrace:
 [1] getindex at ./dict.jl:478 [inlined]
 [2] dispatch(::WebIO.IJuliaConnection, ::Dict{String,Any}) at /home/robert/.julia/packages/WebIO/WN6vl/src/connection.jl:22
 [3] (::getfield(WebIO, Symbol("##73#74")){WebIO.IJuliaConnection})(::IJulia.Msg) at /home/robert/.julia/packages/WebIO/WN6vl/src/providers/ijulia.jl:56
 [4] comm_msg(::ZMQ.Socket, ::IJulia.Msg) at /home/robert/.julia/packages/IJulia/iMVN2/src/comm_manager.jl:134
 [5] #invokelatest#1 at ./essentials.jl:686 [inlined]
 [6] invokelatest at ./essentials.jl:685 [inlined]
 [7] eventloop(::ZMQ.Socket) at /home/robert/.julia/packages/IJulia/iMVN2/src/eventloop.jl:8
 [8] (::getfield(IJulia, Symbol("##15#18")))() at ./task.jl:259

I followed the instructions and ran

cd(Pkg.dir("WebIO", "assets"))
;jupyter labextension install webio
;jupyter labextension enable webio/jupyterlab_entry

[piever]

Thanks for reporting: it is actually a problem in WebIO: https://github.com/JuliaGizmos/WebIO.jl/issues/171

[roberthoenig]

I see. So it sounds like a workaround would be to downgrade WebIO?

[roberthoenig]

And if Interact doesn't depend on any features that are only available in the latest WebIO version, perhaps it could update its dependencies to explicitly pin to an older version of WebIO?

[piever]

You certainly will have more luck asking there: I actually don't really know how the Jupyter Lab / WebIO integration works in practice.

Regarding versions, I wouldn't recommend downgrading as only very recent WebIO versions are compatible with Julia 0.7 and above