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If the GsonBuilder cannot be located, the following steps can be taken:

1. Check if the Gson library is added to the project's dependencies. If not, add it to the dependencies.

2. Ensure that the correct version of the Gson library is added to the project. If not, update the version to the latest one.

3. Check that the GsonBuilder class is imported in the Java code using the correct package name. The import statement should be:

   import com.google.gson.GsonBuilder;

4. Clean and rebuild the project to refresh the dependencies.

5. If using an Integrated Development Environment (IDE) such as Eclipse, IntelliJ IDEA, or NetBeans, restart the IDE and ensure that the project has been properly imported.

6. If the issue persists, uninstall and reinstall the Gson library or try using a different version of Gson.