Looks like something wrong with freight variable in HTML:
Error in app/freightList.component.html:13:8 Error trying to diff \'[object Object]\'
The best way is to take the NgForm object and call its reset() function.
NgForm
reset()
Example:
Html file
ts file
@ViewChild('exampleform') exampleform :NgForm; this.exampleform.reset(); // resets the form