本文介绍了解决Eclipse中DeploymentBuilder项目出现的NullPointerException错误的方法。主要包括：关闭工作区、删除特定配置文件并重新启动IDE。
Errors occurred during the build. Errors running builder 'DeploymentBuilder' on project 'XXX '. java.lang.NullPointerException
1. Shut down the workspace.
2. Delete the file com.genuitec.eclipse.ast.deploy.core.prefs which is located at <workspace dir>/.metadata/.plugins/org.eclipse.core.runtime/.settings/com.genuitec.eclipse.ast.deploy.core.prefs
3. Start the IDE.
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