If you're running into problems when either testing or monitoring a project the first thing to do is to upgrade your version of the cli and try your command again.
npm i -g snyk
Snyk continuously releases new versions of the CLI as we add new features, language support and bug fixes, so don't be surprised if you are a few versions behind!
Alternatively you could consider installing the snyk CLI using npx, to ensure you always use the most recent version.
npx snyk test