How do I troubleshoot 'Cannot find symbol' errors when using external libraries or dependencies?

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Grade: Education Subject: Support
How do I troubleshoot 'Cannot find symbol' errors when using external libraries or dependencies?
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Verify that the required libraries are correctly added to your project's dependencies. Check your `pom.xml` (Maven), `build.gradle` (Gradle), or project settings for the correct library versions and scopes. Ensure the library's JAR file is present in the correct location within your project's dependencies folder.