Hi I have a preview composable defined like this ``` Preview

Question

Hi I have a preview composable defined like this ``` Preview Composable fun PostHeader Preview MyAppTheme PostHeader Post PLACEHOLDER ``` that has a render problem that looks like this `java lang NoSuchMethodException com example myapp components PostHeaderKt PostHeader Preview` full stacktrace in thread thread please I have no idea how to fox that since the method actually exists what can I do

Cyril Find · Answer

```java lang NoSuchMethodException com unique powder components PostHeaderKt PostHeader Preview at androidx compose ui tooling preview PreviewUtilsKt findComposableMethod PreviewUtils kt 72 at androidx compose ui tooling preview PreviewUtilsKt invokeComposableViaReflection PreviewUtils kt 175 at androidx compose ui tooling preview ComposeViewAdapter$init$3$2$composable$1 invoke ComposeViewAdapter kt 437 at androidx compose ui tooling preview ComposeViewAdapter$init$3$2$composable$1 invoke ComposeViewAdapter kt at androidx compose ui tooling preview ComposeViewAdapter$init$3$2 invoke ComposeViewAdapter kt 471 at androidx compose ui tooling preview ComposeViewAdapter$init$3$2 invoke ComposeViewAdapter kt at androidx compose runtime internal ComposableLambda invoke ComposableLambda kt 146 at androidx compose runtime internal ComposableLambda invoke ComposableLambda kt at androidx compose runtime AmbientKt Providers Ambient kt 188 at androidx compose ui tooling InspectableKt Inspectable Inspectable kt 65 at androidx compose ui tooling preview ComposeViewAdapter$WrapPreview$1 invoke ComposeViewAdapter kt 384 at androidx compose ui tooling preview ComposeViewAdapter$WrapPreview$1 invoke ComposeViewAdapter kt at androidx compose runtime internal ComposableLambda invoke ComposableLambda kt 146 at androidx compose runtime internal ComposableLambda invoke ComposableLambda kt at androidx compose runtime AmbientKt Providers Ambient kt 188 at androidx compose ui tooling preview ComposeViewAdapter WrapPreview ComposeViewAdapter kt 383 at androidx compose ui tooling preview ComposeViewAdapter access$WrapPreview ComposeViewAdapter kt at androidx compose ui tooling preview ComposeViewAdapter$init$3 invoke ComposeViewAdapter kt 430 at androidx compose ui tooling preview ComposeViewAdapter$init$3 invoke ComposeViewAdapter kt at androidx compose runtime internal ComposableLambda invoke ComposableLambda kt 146 at androidx compose runtime internal ComposableLambda invoke ComposableLambda kt at androidx compose ui platform ComposeView Content ComposeView kt 293 at androidx compose ui platform AbstractComposeView$ensureCompositionCreated$1 invoke ComposeView kt 161 at androidx compose ui platform AbstractComposeView$ensureCompositionCreated$1 invoke ComposeView kt at androidx compose runtime internal ComposableLambda invoke ComposableLambda kt 146 at androidx compose runtime internal ComposableLambda invoke ComposableLambda kt at androidx compose runtime AmbientKt Providers Ambient kt 188 at androidx compose ui platform AmbientsKt ProvideCommonAmbients Ambients kt 276 at androidx compose ui platform AndroidAmbientsKt$ProvideAndroidAmbients$3 invoke AndroidAmbients kt 176 at androidx compose ui platform AndroidAmbientsKt$ProvideAndroidAmbients$3 invoke AndroidAmbients kt at androidx compose runtime internal ComposableLambda invoke ComposableLambda kt 146 at androidx compose runtime internal ComposableLambda invoke ComposableLambda kt at androidx compose runtime AmbientKt Providers Ambient kt 188 at androidx compose ui platform AndroidAmbientsKt ProvideAndroidAmbients AndroidAmbients kt 168 at androidx compose ui platform WrappedComposition$setContent$1$1$3 invoke Wrapper kt 261 at androidx compose ui platform WrappedComposition$setContent$1$1$3 invoke Wrapper kt at androidx compose runtime internal ComposableLambda invoke ComposableLambda kt 146 at androidx compose runtime internal ComposableLambda invoke ComposableLambda kt at androidx compose runtime AmbientKt Providers Ambient kt 188 at androidx compose ui platform WrappedComposition$setContent$1$1 invoke Wrapper kt 260 at androidx compose ui platform WrappedComposition$setContent$1$1 invoke Wrapper kt at androidx compose runtime internal ComposableLambda invoke ComposableLambda kt 146 at androidx compose runtime internal ComposableLambda invoke ComposableLambda kt at androidx compose runtime ComposerKt invokeComposable Composer kt 2906 at androidx compose runtime Composer composeInitial Composer kt 2046 at androidx compose runtime Recomposer composeInitial$runtime release Recomposer kt 566 at androidx compose runtime CompositionImpl setContent Composition kt 109 at androidx compose ui platform WrappedComposition$setContent$1 invoke Wrapper kt 243 at androidx compose ui platform WrappedComposition$setContent$1 invoke Wrapper kt at androidx compose ui platform AndroidComposeView setOnViewTreeOwnersAvailable AndroidComposeView kt 548 at androidx compose ui platform WrappedComposition setContent Wrapper kt 234 at androidx compose ui platform WrappedComposition onStateChanged Wrapper kt 285 at androidx lifecycle LifecycleRegistry$ObserverWithState dispatchEvent LifecycleRegistry java 354 at androidx lifecycle LifecycleRegistry addObserver LifecycleRegistry java 196 at androidx compose ui platform WrappedComposition$setContent$1 invoke Wrapper kt 241 at androidx compose ui platform WrappedComposition$setContent$1 invoke Wrapper kt at androidx compose ui platform AndroidComposeView onAttachedToWindow AndroidComposeView kt 617 at android view View dispatchAttachedToWindow View java 20479 at android view ViewGroup dispatchAttachedToWindow ViewGroup java 3489 at android view ViewGroup dispatchAttachedToWindow ViewGroup java 3496 at android view ViewGroup dispatchAttachedToWindow ViewGroup java 3496 at android view ViewGroup dispatchAttachedToWindow ViewGroup java 3496 at android view ViewGroup dispatchAttachedToWindow ViewGroup java 3496 at android view ViewGroup dispatchAttachedToWindow ViewGroup java 3496 at android view AttachInfo Accessor setAttachInfo AttachInfo Accessor java 44 at com android layoutlib bridge impl RenderSessionImpl inflate RenderSessionImpl java 361 at com android layoutlib bridge Bridge createSession Bridge java 431 at com android tools idea layoutlib LayoutLibrary createSession LayoutLibrary java 141 at com android tools idea rendering RenderTask createRenderSession RenderTask java 696 at com android tools idea rendering RenderTask lambda$inflate$6 RenderTask java 852 at com android tools idea rendering RenderExecutor$runAsyncActionWithTimeout$2 run RenderExecutor kt 187 at java base java util concurrent ThreadPoolExecutor runWorker ThreadPoolExecutor java 1128 at java base java util concurrent ThreadPoolExecutor$Worker run ThreadPoolExecutor java 628 at java base java lang Thread run Thread java 834 ```

jim · Answer

That error doesn t give us a ton of info to work with unfortunately Just throwing some ideas questions out there Are you sure Compose is properly enabled for the module where `PostHeader Preview` is defined If Compose is not properly enabled the Compose Compiler may not be running on the code and thus not generating the code expected by preview Are any other preview functions in your app working Is Compose working in general if you deploy to a device Are your preview functions in the same module as your other Composable functions What version of Compose and what version of AndroidStudio are you using

Cyril Find · Answer

Hi thanks a lot for your answer So here s more info Yes the app is almost not modularized yet and Compose is enabled Everything works when launching to a device some Previews work but only very basic components because it s been too unstable slow for me to use them a lot and also because I haven t found a way to preview components that use `CoilImage` which is almost all of them I m using alpha10 and the latest Canary Android Studio Arctic Fox | 2020 3 1 Canary 4 AI 202 7319 50 2031 7049475

JulianK · Answer

I remember having a similar exception didn t have this problem with alpha08 skipped 09 I think it just disappeared after hitting compile build refresh or something sorry i know this is not very helpful In general the preview seems to be not really stable and more importantly very slow It s way faster to just launch the app