What version of Node are you using?
What version of JET are you using?
Here what that I'm using:
Node version: 10.16.0
OJET: @oracle/oraclejet": "^6.2.0"
The node version looks good. Can you try updating to the latest JET release and see if that helps. I'm not aware of any issues with older releases, but we have updated library dependencies since 6.2.0 was released and that may have fixed what you're seeing. There is also a security issue with the version of jQuery that was distributed with JET 6.2.0. That was fixed in JET v7.0.1.
I'll try to update to latest JET release and let you know.
I have updated to the latest JET and still have the same issue. The issue may be with my pc. I'll check with another pc and see.
What version of Node and npm are you using Festau? Please make sure you have at least Node 10x and npm 6.x in use. The LTS release of Node is usually recommended.