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npx kill-port 3000 (for kill port if port already use )
You can search on how to kill that process. For Linux/Mac OS search (sudo) run this in the terminal: $ lsof -i tcp:3000 $ kill -9 PID On Windows: netstat -ano | findstr :3000 tskill typeyourPIDhere change tskill for taskkill in git bash
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npm cache clean --force (if some node package error installing)