China Naming Network - Solar terms knowledge - What is the reason for this error when running struts program?

What is the reason for this error when running struts program?

Don't refer to the unnecessary package struts2-gxp-plugin-2.3.24.jar, and at least include the following packages:

And then what? Delete the project under Tomcat (to prevent the package from being deleted) and republish the project.

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