Gulp bundle --ship: The build failed because a task wrote output to stderr

I've been getting this error when trying to do a gulp bundle --ship command:

The build failed because a task wrote output to stderr. Exiting with exit code: 1

I'm pretty new to this so have no idea how to proceed with it. It's happening even when I run through the helloworld webpart now. The gulp serve works and I can bundle and package the solution as long as I don't add a --ship to it. I've written and published apps before on the same machine so I don't know what is different now.

I've uninstalled every extension and re-installed the application but it's still doing it. Any help would be appreciated.