Package.json not opened in @angular/core

while i’m trying to run my app on android emulator or ios emulator it’s trouging error like the below.

[10:38:36] ionic-app-script task: “build”
[10:38:36] Error: ENOENT: no such file or directory, open

i tried several ways like:
1.removed package-lock.json,node modules and reinstall the modules by npm install.
2.Installed the node modules with npm install -D

even also it througs the same error.

when i checked in node_modules there is no folder present with name @angular