# Execution Failed for Task: app:kaptDebugKotlin
When attempting to build your Android project, you may encounter the following error message:
“`
Execution failed for task ‘:app:kaptDebugKotlin’.
> A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptExecution
“`
This error message indicates that the Kotlin annotation processing (KAPT) failed during the compilation process. KAPT is responsible for generating code based on annotations in your Kotlin classes.
Here are some possible reasons for this error, along with solutions to fix them.
## Out of Memory Error
If your project is large and complex, it may require more memory than is allocated by default. This can result in an “out of memory” error during the KAPT process.
### Solution
You can increase the memory allocation for Gradle by adding the following to your `gradle.properties` file:
“`
org.gradle.jvmargs=-Xmx4096m
“`
Adjust the `-Xmx` value according to your system’s available memory.
## Conflicts with Lombok
If you are using Lombok annotations alongside Kotlin annotations, there may be conflicts between the two.
### Solution
Add the following to your `build.gradle` file to exclude Lombok annotations from KAPT:
“`
kapt {
javacOptions {
option(“-dontwarn”, “lombok.**”)
}
}
“`
## Problems with Annotation Processors
If you have recently updated your project’s dependencies, it is possible that an incorrect or outdated annotation processor is causing the KAPT process to fail.
### Solution
Try cleaning your Gradle cache and rebuilding your project with the following commands:
“`
./gradlew clean
./gradlew build –refresh-dependencies
“`
If this does not work, try removing the `build` folder and rebuilding the project:
“`
rm -rf build/
./gradlew build
“`
## Issues with the Kotlin Compiler
In some cases, the KAPT process may fail due to issues with the Kotlin compiler.
### Solution
Try updating the version of Kotlin that your project uses and rebuilding:
“`
buildscript {
ext.kotlin_version = “
…
}
“`
You can also try cleaning your Gradle cache and rebuilding the project, as described in the previous section.
## Conclusion
The `Execution Failed for Task: app:kaptDebugKotlin` error message can be frustrating to deal with, but there are several solutions that can help you resolve the issue. By following the steps outlined in this article, you should be able to overcome the obstacle and continue building your Android project with confidence.