What is the reason for the error message: java.lang.ClassNotFoundException: org.springframework.core.env.Profiles?

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This error message occurs because the class org.springframework.core.env.Profiles cannot be found in the classpath of the application. This may be due to a missing or incorrect entry in the application's classpath, or a missing or incorrect version of the required Spring framework libraries. It could also be due to a configuration issue in the application's build or deployment process.