Couldn't load options using mocha: child process exited with code 9 and signal null

[dhowe]

Trying to add the extension to a project (even an empty project with just one test), and I get the following error:

[Error: Couldn't load options using mocha: child process exited with code 9 and signal null
	at ChildProcess.<anonymous> (/Users/dhowe/.vscode/extensions/hbenl.vscode-mocha-test-adapter-2.14.1/out/optsReader.js:89:32)
	at Object.onceWrapper (node:events:646:26)
	at ChildProcess.emit (node:events:526:28)
	at maybeClose (node:internal/child_process:1092:16)
	at Socket.<anonymous> (node:internal/child_process:451:11)
	at Socket.emit (node:events:526:28)
	at Pipe.<anonymous> (node:net:687:12)]