Mars Photo App Error

[Rade57]

URL of codelab:

Update MarsApiService and MarsViewModel

I followed every step from start, when i dowloaded the starter code everything is working fine, till the last step "In the getMarsPhotos() method, listResult is a List and not a String anymore. The size of that list is the number of photos that were received and parsed.

To print the number of photos retrieved, update marsUiState as follows:

val listResult = MarsApi.retrofitService.getPhotos()
marsUiState = MarsUiState.Success(
"Success: ${listResult.size} Mars photos retrieved"
)" it gives me error so i did like this private fun getMarsPhotos() {
viewModelScope.launch {
marsUiState = try {
val listResult = MarsApi.retrofitService.getPhotos()
MarsUiState.Success(
"Success: ${listResult.size} Mars photos retrieved")
} catch (e: IOException) {
MarsUiState.Error
}
}
}

Versions
_Android Studio version:_Android Studio Ladybug Feature Drop | 2024.2.2 Patch 1
API version of the emulator: API 34

Additional information
Include screenshots if they would be useful in clarifying the problem.
App crashed on start and i get this error, and by the way solution code is a lot different than starter code + this lessons

[Lazyaair]

gemini told me this，and solve this problem successfully

1. Because you used org.jetbrains.kotlin.plugin.compose, your project's Kotlin compiler version must be 2.0.0 or higher.

2. However, you forcibly specified the Kotlin serialization plugin version as "1.8.10".

3. In Kotlin 2.0+, all Kotlin compiler plugins (such as serialization) must strictly match the Kotlin compiler version.

4. Due to this severe version mismatch, the Kotlin 2.0 compiler directly ignores the 1.8.10 serialization plugin and does not report an error during compilation. This renders your @Serializable annotation ineffective; the underlying system does not automatically generate JSON parsing code for you (i.e., MarsPhoto.$serializer is missing).

5. At runtime, Retrofit fails to retrieve the MarsPhoto serializer, throwing an exception, which is ultimately wrapped by Retrofit into an "Unable to create converter" crash.

• (Note: The java.util.List in the error message is perfectly normal. Kotlin's List is compiled into Java's List at the underlying level, so Retrofit's error log printing this is not a problem. The key issue is that it cannot parse MarsPhoto within it.)