ArgumentError: Package REPLExt [e5eb5ef1-03cf-53a7-ae1d-5a66b08e832b] is required but does not seem to be installed

I’m having this issue in VSCode, not sure exactly what is going on, I am quite clueless.

Might be this bug: REPLExt: no method matching repl_init(::REPL.LineEditREPL) when loading packages in REPL mode. · Issue #56216 · JuliaLang/julia · GitHub

If you are a beginner, I would stick with Julia 1.10 for now, 1.11 still has some bugs that need to be ironed out.

juliaup add 1.10
juliaup default 1.10
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Thanks, can’t recall exactly how but I’ve fixed the issue now.