Cannot determine the module for class X in X.ts! Add X to the NgModule to fix it error in ionic2

Question

I am facing an issue when I try to build my app using the following command :

ionic cordova run android --prod --release

Everything runs fine if

Answer 1

I had the same problem , but for me, two components with the same name were there something like below,

my-first-app\src\app\header\header.component.ts

my-first-app\src\header\header.component.ts

the second one is unused and wrongly placed as all my codes were inside my-first-app\src\app only. I removed the second one and it resolved my issue.