Launch Web Server is failing in local dev due to server crash

Describe the bug

I have been trying to get the vscode-yaml web extension in the debug mode. But the is server crashing

Expected Behavior

Following the Contributing.MD I opened a vscode window with vscode-yaml and added yaml-language-server folder to the workspace attached yaml-language-server and ran the task. Launch VSCode Web extension. A vscode debug mode window with an active yaml extension was expected.

Current Behavior

A debug window is opening with output channel YAML Support but the extension is not working. features autocomplete, format and syntactic validation.

Steps to Reproduce

1. clone vscode-yaml and yaml-language-server to a folder
2. edit vscode-yaml/package.json dependecy "yaml-language-server": "file:../yaml-language-server"
3. run cd vscode-yaml and code . from the folder (This opens a vscode workspace with current working directory)
4. add yaml-language-server folder to the vscode-yaml workspace by going to File -> Add Folder to Workspace
5. select Run and Debug from the left SideBar of the workspace and Run task Attach to Server(yaml-language-server)
6. Run task Launch Web Extension
7. Click Debug Anyway when prompted

Environment

• Windows
• Mac
• Linux
• other (please specify)

Start with Contributing.MD and the package.json dependency setup described in the issue, then reproduce the Attach to Server(yaml-language-server) and Launch Web Extension tasks on macOS. Inspect the YAML Support output channel for the server failure. Done means the debug window has a working YAML extension with autocomplete, formatting, and syntactic validation.