Haxe version does not support JSON-RPC

Help
#1

After the latest OpenFL, Lime, Haxe updates, when I open a project in Visual Studio Code for macOS, I get this warning:

Unable to build cache - completion features may be slower than expected. Try fixing the error(s) and restarting the language server.

The associated error message is:

Haxe language server started
Listening on port 6000
Haxe version does not support JSON-RPC, using legacy --display API.
Building Cache…
Failed - try fixing the error(s) and restarting the language server:

How do I fix this?

#2

Do you have Haxe 3.4.3 or greater installed?

Have you built your project successfully at least once?

#3

I’m using Haxe 3.4.7 and it happens on all projects, even previously completed projects.

The source seems to be the Haxe v. 2.4.0 extension by nadako. If I try to disable it I get the message “Cannot disable extension ‘Haxe’. Extension ‘Lime’ depends on this.”

I never had this problem before and so far I can still do a build successfully. A few times a build seems to hang and I have to quit VSC, restart it and build again. That didn’t happen until after getting the “Unable to build” warning. I’m concerned that a future update to OpenFL, Have, etc. will make doing a build impossible.

#4

Well, there should always be the command-line, though I do know that the extension for Visual Studio is increasingly designed for the Haxe 4 preview, which is continuing to add better IDE support

#5

Haxe version does not support JSON-RPC, using legacy --display API.

That’s just a warning and completely unrelated to the failure afterwards. There must be some error after the Failed - ... line?