Error: ENOSPC: System limit for number of file watchers reached, watch : Ubuntu 18.04

  1. See this answer on stackexchange (not mine)

I suspect the watches from the previous day are still in effect.

  1. It can happen anytime you run out of instances or watches. See previous link. User Oligofren's script and explaination is excellent.

  2. Killing the watching process should work. On my machine exiting VS Code freed up ~470 watches.