Ionic serve -l not updating for only one project

hi there ,
i have this issue which is strange am working in multiple ionic projects so they r all in the same environment
but since yesterday one of my projects stopped being reloaded in ionic serve so whenever i do a change i need to serve the project again and again
ionic/cli-utils : 1.19.2
ionic (Ionic CLI) : 3.20.0


Node : v7.2.1
npm  : 3.10.10 
OS   : macOS High Sierra


backend : legacy

if any one can help
i dont want to delete node modules since i made some changes on them also i dont want to create another project folder since i made changes in ios and android projects :slight_smile:
so if you have any new solution please share it