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When Heroku crashes due to reaching the system limit for the number of file watchers with ENOSPC, it means that the operating system has reached its maximum capacity for monitoring changes to files in a directory. This can occur because the system has exceeded its designated limit, or because there are too many applications running simultaneously that are trying to watch the same files. This error can cause an application to become unresponsive or stop working completely. To resolve this issue, you may need to increase the system limit for file watchers, optimize file monitoring in your application, or reduce the number of applications running simultaneously.