fix an angular js form

the country is not loading, i have this error, BUT i only have the .js files.

core.js:1673 ERROR TypeError: Cannot read properties of undefined (reading 'toLowerCase')
at enroll-coupon.component.ts:168
at Array.find (<anonymous>)
at EnrollCouponComponent.push../src/app/enroll-coupon/enroll-coupon.component.ts.EnrollCouponComponent.setSelectedRegion (enroll-coupon.component.ts:167)
enroll-coupon.component.ts
that is the typescript file