Kotlin is a static programming language that runs on top of the Java virtual machine and can be compiled to Java source code or the LLVM compiler infrastructure. It is sponsored and developed by JetBrains.

This error can occur frequently when you try to run the program: AAPT: error: resource android:color/system_neutral1_1000 not found in Kotlin.

This is a popular error made by many coders. So, why did the error occur, and how could it be resolved? We’ll talk about everything with you.

Why Does The Error Occur?

Recently you have been trying to build this project, and you face the following error.

ERROR:C:\Users\ssc.gradle\caches\transforms-2\files-2.1\66e9dd10963e7a2704a4a2116f19e6fb\material-1.5.0-alpha03\res\values-v31\values-v31.xml:3:5-94: AAPT: error: resource android:color/system_neutral1_1000 not found.)

How to fix error “AAPT: error: resource android:color/system_neutral1_1000 not found in Kotlin.”

And, you know what, you might be able to solve that with some simple ways. We can better understand these solutions by using the cases below.

1) Update app’s compileSdkVersion to 31

According to the release notes, if you insist on using material:1.5.0-alpha03, the new Material 3 themes and materials are included in version 1.5.0-alpha03. Starting with 1.5.0-alpha03, the library requires SDK 31 to be compiled.

So, when using a new version of the library, update your app’s compileSdkVersion to 31. Alternatively, downgrade to 1.4.0 / 1.5.0-alpha02.

2) Change or downgrade your dependencies

Double check your version, if yours is:

implementation 'androidx.appcompat:appcompat:1.4.0'
implementation 'com.google.android.material:material:1.5.0'

Let’s convert it like below:

implementation 'androidx.appcompat:appcompat:1.3.0'
implementation 'com.google.android.material:material:1.4.0'

Then, you can run the application again.

3) Use material:1.5.0-alpha02

This error might occur when you are using the following material: 1.5.0-alpha03. As a result, use material:1.5.0-alpha02.

Delete this line.

implementation 
'com.google.android.material:material:1.5.0-alpha03'

Also, replace with.

implementation 
'com.google.android.material:material:1.5.0-alpha02'

We believe that the above solutions will be beneficial to all readers.

Conclusion

Kotlin is a programming language for modern cross-platform applications compatible with Android.

The solutions mentioned above have been the most effective for individuals who are still perplexed by this error: AAPT: error: resource android:color/system_neutral1_1000 not found in Kotlin.

When you still seek help or have other questions, we have a big community where everyone is always willing to help. Finally, we hope all readers have a fantastic day with innovative code solutions.