Error: ENOSPC: System limit for number of file watchers reached, watch : Ubuntu 18.04
- See this answer on stackexchange (not mine)
I suspect the watches from the previous day are still in effect.
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It can happen anytime you run out of instances or watches. See previous link. User Oligofren's script and explaination is excellent.
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Killing the watching process should work. On my machine exiting VS Code freed up ~470 watches.