遇到errors occurred during the build这个问题很久了，没有找到好的方法，一直都是用debug下的apk包再签名，这样就不能对apk包进行混淆和加密等操作了，诸多不便！
所以还是要解决这个问题，百度是不行了，于是进到项目根目录下进入.detadata文件夹下，查看eclipse的日志文件.log。查看后得知，如下所示：
!ENTRY com.android.ide.eclipse.adt 4 0 2015-05-04 09:58:57.962
!MESSAGE Export Wizard Error
!STACK 1
org.eclipse.core.internal.resources.ResourceException: Errors occurred during the build.
at org.eclipse.core.internal.resources.Project$1.run(Project.java:620)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2345)
at org.eclipse.core.internal.resources.Project.internalBuild(Project.java:597)
at org.eclipse.core.internal.resources.Project.build(Project.java:124)
at com.android.ide.eclipse.adt.internal.project.ProjectHelper.compileInReleaseMode(ProjectHelper.java:1072)
at com.android.ide.eclipse.adt.internal.project.ProjectHelper.compileInReleaseMode(ProjectHelper.java:1041)
at com.android.ide.eclipse.adt.internal.project.ProjectHelper.compileInReleaseMode(ProjectHelper.java:1014)
at com.android.ide.eclipse.adt.internal.project.ExportHelper.exportReleaseApk(ExportHelper.java:99)
at com.android.ide.eclipse.adt.internal.wizards.export.ExportWizard.doExport(ExportWizard.java:305)
at com.android.ide.eclipse.adt.internal.wizards.export.ExportWizard.access$0(ExportWizard.java:234)
at com.android.ide.eclipse.adt.internal.wizards.export.ExportWizard$1.run(ExportWizard.java:219)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
Contains: Errors running builder 'Integrated External Tool Builder' on project 'UmengLibs'.
org.eclipse.core.runtime.CoreException: The builder launch configuration could not be found.
at org.eclipse.core.externaltools.internal.ExternalToolsCore.newError(ExternalToolsCore.java:112)
at org.eclipse.core.externaltools.internal.model.ExternalToolBuilder.build(ExternalToolBuilder.java:76)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:733)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:206)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:328)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:403)
at org.eclipse.core.internal.resources.Project$1.run(Project.java:618)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2345)
at org.eclipse.core.internal.resources.Project.internalBuild(Project.java:597)
at org.eclipse.core.internal.resources.Project.build(Project.java:124)
at com.android.ide.eclipse.adt.internal.project.ProjectHelper.compileInReleaseMode(ProjectHelper.java:1072)
at com.android.ide.eclipse.adt.internal.project.ProjectHelper.compileInReleaseMode(ProjectHelper.java:1041)
at com.android.ide.eclipse.adt.internal.project.ProjectHelper.compileInReleaseMode(ProjectHelper.java:1014)
at com.android.ide.eclipse.adt.internal.project.ExportHelper.exportReleaseApk(ExportHelper.java:99)
at com.android.ide.eclipse.adt.internal.wizards.export.ExportWizard.doExport(ExportWizard.java:305)
at com.android.ide.eclipse.adt.internal.wizards.export.ExportWizard.access$0(ExportWizard.java:234)
at com.android.ide.eclipse.adt.internal.wizards.export.ExportWizard$1.run(ExportWizard.java:219)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
Contains: The builder launch configuration could not be found.
!SUBENTRY 1 org.eclipse.core.resources 4 566 2015-05-04 09:58:57.963
!MESSAGE Errors occurred during the build.
!SUBENTRY 2 org.eclipse.core.externaltools 4 75 2015-05-04 09:58:57.963
!MESSAGE Errors running builder 'Integrated External Tool Builder' on project 'UmengLibs'.
!STACK 1
org.eclipse.core.runtime.CoreException: The builder launch configuration could not be found.
at org.eclipse.core.externaltools.internal.ExternalToolsCore.newError(ExternalToolsCore.java:112)
at org.eclipse.core.externaltools.internal.model.ExternalToolBuilder.build(ExternalToolBuilder.java:76)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:733)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:206)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:328)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:403)
at org.eclipse.core.internal.resources.Project$1.run(Project.java:618)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2345)
at org.eclipse.core.internal.resources.Project.internalBuild(Project.java:597)
at org.eclipse.core.internal.resources.Project.build(Project.java:124)
at com.android.ide.eclipse.adt.internal.project.ProjectHelper.compileInReleaseMode(ProjectHelper.java:1072)
at com.android.ide.eclipse.adt.internal.project.ProjectHelper.compileInReleaseMode(ProjectHelper.java:1041)
at com.android.ide.eclipse.adt.internal.project.ProjectHelper.compileInReleaseMode(ProjectHelper.java:1014)
at com.android.ide.eclipse.adt.internal.project.ExportHelper.exportReleaseApk(ExportHelper.java:99)
at com.android.ide.eclipse.adt.internal.wizards.export.ExportWizard.doExport(ExportWizard.java:305)
at com.android.ide.eclipse.adt.internal.wizards.export.ExportWizard.access$0(ExportWizard.java:234)
at com.android.ide.eclipse.adt.internal.wizards.export.ExportWizard$1.run(ExportWizard.java:219)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
!SUBENTRY 3 org.eclipse.core.externaltools 4 0 2015-05-04 09:58:57.963
!MESSAGE The builder launch configuration could not be found.
!SUBENTRY 2 org.eclipse.core.externaltools 4 0 2015-05-04 09:58:57.963
!MESSAGE The builder launch configuration could not be found.问题出在：
Contains: Errors running builder 'Integrated External Tool Builder' on project 'UmengLibs'.如此，选择‘UmengLibs’项目，右键单击；选择“Properties”选项，在弹出菜单中选择“Builders”项；删除带红叉的builders，然后就可以导出项目了。
来源：oschina
链接：https://my.oschina.net/u/919612/blog/410271