Help. I'm stuck. I can't build gnome-sound-recorder project: requested extension (node18) isn't installed, but also not listed by `flatpak search`

I am trying to build gnome-sound-recorder project using flatpack GNOME builder for the first time, but with no success. When I click the build button, I get this error message:

Initializing build dir
error: Requested extension org.freedesktop.Sdk.Extension.node18/x86_64/master not installed
Error: Child process exited with code 1

I have installed every node18 version available in flatpak, but the error still persists. I also have found someone suggesting to change my runtime-version from “master” to “45”. How do I do that?

EDIT: to change the runtime-version, you need to find the manifest file of your project. In my case, the manifest file is org.gnome.SoundRecorder.json and 43 was the working version. Best of luck to anyone stumbling upon this.

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