Gradle version 2.2 is required. Current version is 3.0. Please fix the project's Gradle settings. Gradle Settings.

This error message means that the Gradle version being used by the project is not compatible with the required version. To fix this issue, you can either update the Gradle version of your project to version 2.2 or downgrade the current Gradle version to version 2.2.

To update the Gradle version of your project, you can follow these steps:

1. Open the build.gradle file of your project.
2. Find the line that specifies the Gradle version, it should look like this: `classpath 'com.android.tools.build:gradle:3.0.0'`
3. Replace the Gradle version number with the required version number, which is 2.2: `classpath 'com.android.tools.build:gradle:2.2.0'`
4. Sync your project with the Gradle files to apply the changes.

If you want to downgrade the current Gradle version to version 2.2, you can follow these steps:

1. Open the Gradle distribution website at https://services.gradle.org/distributions/
2. Download the Gradle version 2.2 distribution by clicking on the link that says `gradle-2.2-all.zip`
3. Extract the downloaded file into a new folder on your computer.
4. Open the `gradle/wrapper/gradle-wrapper.properties` file of your project.
5. Change the following line: `distributionUrl=https\://services.gradle.org/distributions/gradle-3.0-all.zip`
6. To: `distributionUrl=file:///path/to/gradle-2.2-all.zip`
7. Replace `/path/to/gradle-2.2-all.zip` with the actual path to the extracted Gradle 2.2 distribution on your computer.
8. Sync your project with the Gradle files to apply the changes.

After following either of these steps, the project should now be using the required Gradle version and the error message should no longer appear.