2019-11-17 15:05:54.110 9586-9586/? E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.composeexample, PID: 9586
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.composeexample/com.example.composeexample.MainActivity}: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter r
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
     Caused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter r
        at androidx.compose.frames.FramesKt._writable(Unknown Source:2)
        at com.example.composeexample.CurrentTimeStamp.setValues(Unknown Source:10)
        at com.example.composeexample.CurrentTimeStamp.<init>(TimeStampModel.kt:18)
        at com.example.composeexample.MainActivity$onCreate$1$1$1$1.invoke(MainActivity.kt:18)
        at com.example.composeexample.MainActivity$onCreate$1$1$1$1.invoke(Unknown Source:0)
        at androidx.compose.ObserveKt.Observe(Observe.kt:39)
        at com.example.composeexample.MainActivity$onCreate$1$1$1.invoke(Unknown Source:7)
        at com.example.composeexample.MainActivity$onCreate$1$1$1.invoke(Unknown Source:0)
        at androidx.compose.Ambient.Provider(Ambient.kt:109)
        at androidx.ui.material.MaterialThemeKt$MaterialShapeTheme$1.invoke(MaterialTheme.kt:313)
        at androidx.ui.material.MaterialThemeKt$MaterialShapeTheme$1.invoke(Unknown Source:0)
        at androidx.compose.ObserveKt.Observe(Observe.kt:39)
        at androidx.ui.material.MaterialThemeKt.MaterialShapeTheme(Unknown Source:12)
        at androidx.ui.material.MaterialThemeKt$MaterialTheme$1$1$1$1$1$1$1$1$1.invoke(MaterialTheme.kt:329)
        at androidx.ui.material.MaterialThemeKt$MaterialTheme$1$1$1$1$1$1$1$1$1.invoke(Unknown Source:0)
        at androidx.compose.ObserveKt.Observe(Observe.kt:39)
        at androidx.ui.material.MaterialThemeKt$MaterialTheme$1$1$1$1$1$1$1$1.invoke(Unknown Source:9)
        at androidx.ui.material.MaterialThemeKt$MaterialTheme$1$1$1$1$1$1$1$1.invoke(Unknown Source:0)
        at androidx.compose.Ambient.Provider(Ambient.kt:109)
        at androidx.ui.material.MaterialThemeKt$MaterialRippleTheme$1.invoke(MaterialTheme.kt:248)
        at androidx.ui.material.MaterialThemeKt$MaterialRippleTheme$1.invoke(Unknown Source:0)
        at androidx.compose.ObserveKt.Observe(Observe.kt:39)
        at androidx.ui.material.MaterialThemeKt.MaterialRippleTheme(Unknown Source:7)
        at androidx.ui.material.MaterialThemeKt.access$MaterialRippleTheme$0(Unknown Source:0)
        at androidx.ui.material.MaterialThemeKt$MaterialTheme$1$1$1$1$1$1$1.invoke(MaterialTheme.kt:329)
        at androidx.ui.material.MaterialThemeKt$MaterialTheme$1$1$1$1$1$1$1.invoke(Unknown Source:0)
        at androidx.compose.ObserveKt.Observe(Observe.kt:39)
        at androidx.ui.material.MaterialThemeKt$MaterialTheme$1$1$1$1$1$1.invoke(Unknown Source:9)
        at androidx.ui.material.MaterialThemeKt$MaterialTheme$1$1$1$1$1$1.invoke(Unknown Source:0)
        at androidx.ui.core.TextKt$CurrentTextStyleProvider$1$1$1.invoke(Text.kt:364)
        at androidx.ui.core.TextKt$CurrentTextStyleProvider$1$1$1.invoke(Unknown Source:0)
        at androidx.compose.ObserveKt.Observe(Observe.kt:39)