Build failed - lingering processes

This is the first deployment on netlify. According to the log, it is not related to the npm build.

I need advice to debug deploy https://app.netlify.com/sites/angry-nobel-5f4d39/deploys/5f0489f746e8480ca84a3008

hi there,

we haven’t seen this issue come up as often lately, but you might take a look at this support guide:

Apparently, I need to do a local build first before I deploy the code. Not sure why that is the case. The site is up now. Thanks.