Could not find com.android.tools.build:gradle:8.0.

As an AI language model, I don't have access to your specific development environment, but here are a few suggestions to troubleshoot this error:

1. Check your Gradle version: Make sure you have the latest version of Gradle installed. You can check your current Gradle version by running the command `gradle --version` in your terminal.

2. Check your Android Studio version: Make sure you have the latest version of Android Studio installed. You can check your current Android Studio version by going to "Help" > "About Android Studio".

3. Check your build.gradle file: Check your project's build.gradle file and make sure that the following line is included: `classpath 'com.android.tools.build:gradle:8.0.0'`. If it is not included, add it to your dependencies.

4. Check your internet connection: Make sure that your internet connection is stable and try to sync your project again.

5. Disable offline mode: Go to "File" > "Settings" > "Build, Execution, Deployment" > "Gradle" and uncheck "Offline work". This will force Gradle to download the necessary dependencies.

If none of these solutions work, you may need to provide more information about your specific development environment and the steps you took before encountering this error.