# Angular / ngFor and TrackBy

**URL:** https://forum.codewithmosh.com/t/angular-ngfor-and-trackby/5464
**Category:** Angular
**Created:** [June 12, 2021, 4:30am UTC](https://forum.codewithmosh.com/t/angular-ngfor-and-trackby/5464 "2021-06-12T04:30:49Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![bory](https://avatars.discourse-cdn.com/v4/letter/b/2acd7d/32.png) [@bory](https://forum.codewithmosh.com/u/bory)
#### Post date: [June 12, 2021, 4:30am UTC](https://forum.codewithmosh.com/t/angular-ngfor-and-trackby/5464/1 "2021-06-12T04:30:49Z")

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Hi everyone,  
I don’t know why its always error that like that as photo as attached.  
Please help checking for me.

Thank you in advance.

 ![Screen Shot 2021-06-12 at 11.27.49 AM](https://us1.discourse-cdn.com/flex020/uploads/codewithmosh/original/2X/5/58fb3e7bfac5d655319afd17f846b1e552a56722.png)