Nodemon is crashing in a simple code of exporting the files from one JavaScript file to another file

I was expecting that the exported document should run on website showing mongodb collections it was a simple boiler plate code available on express js website and in another file it was a code of mongoose js to specify the fields of mongodb. When I write npx nodemon filename.js and then click on tab and enter the error is showing that nodemon is crashing and file is not showing