Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)

[Dtzer0]

Hello :) Before entering, my English is immature. Plus, it's my first time writing an issue. 🙏

A problem occurred while I working on "pageview" and "pageControl" as GitHub and Youtube examples. Here is my code.

( Is my image coming out well..? ) What can I do? When I build, there is an error in the 32nd line. but the test confirmed that the error appeared in all codes in the "didset" section.

xcode13.0, ios15.0 Plus, when I adding "Cocoapod", I was change "Xcode" version to 12.0 for a moment because an error.

Thanks.