I’ve got this error “Could not find the project main file inside of the workspace config (src)” trying to install angular-calendar with the command “ng add angular-calendar”

ng add angular-calendar
Skipping installation: Package already installed
? What date adapter would you like to use? date-fns [ https://date-fns.org/ ]
? Please enter a path to the NgModule that will use the calendar. It should be relative to the root project directory, for example src/app/app.module.ts (optional, will use the root app module if not
specified)
? Please enter the name of the project that will use the calendar (optional, will use the default project if not specified) frontend
Added “angular-calendar” into dependencies
Added “date-fns” into dependencies
Installing angular calendar dependencies…
Add modules imports options…
Could not find the project main file inside of the workspace config (src)
(base) baba@baba:~/pfe/template/frontend$