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Caused by android.util.AndroidRuntimeException: requestFeature() must be called before adding content at com.android.internal.policy.PhoneWindow.requestFeature(PhoneWindow.java:396) at android.app.Activity.requestWindowFeature(Activity.java:5110) at com.navercorp.nid.oauth.activity.NidOAuthWebViewActivity.onCreate(NidOAuthWebViewActivity.kt:67) at android.app.Activity.performCreate(Activity.java:8071) at android.app.Activity.performCreate(Activity.java:8051) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1330) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3629) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3813) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)...