[error] kotlinx.serialization compiler plugin is not applied to the module, so this annotation would not be processed. Make sure that you've setup your buildscript correctly and re-import project.

에러 내용: kotlinx.serialization compiler plugin is not applied to the module, so this annotation would not be processed. Make sure that you've setup your buildscript correctly and re-import project.

 

원인: 앱 모듈에 "org.jetbrains.kotlin.plugin.serialization" plugin을 추가하지 않아서 발생한 문제였다.

해결: 앱 모듈에 "org.jetbrains.kotlin.plugin.serialization" plugin 추가

plugins {
    id("org.jetbrains.kotlin.plugin.serialization") version "1.9.20"
}