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Unable to activate checkin activity

Hi experts,

I m doing a Java Webdynpro application. I can build the DC successfully on my Netweaver Studio. However after checkin the activity, i am unable to activate it. From the CBS log, it is showing the following error. I have no ideal how to fix this error. Can anyone help ? Nevertheless I have tried to reimport all my models from the netweaver development studio but still got the same error.

Please see the error:

[ddgen] [Error] Structure com.diagonal.pp.recipe.getdetailmodel.types.Zkrs02Getdtl_Hdr is not generated

[ddgen] [Error] BuiltIn Type or Simple Type expected

[ddgen] [Info] Catching throwable null

[ddgen] [Info] com.sap.dictionary.generation.ant.GenerationAntTaskError

[ddgen] at com.sap.dictionary.generation.ant.GenerationAnt.showCheckResult(GenerationAnt.java:171)

[ddgen] at com.sap.dictionary.tools.generation.Generation.generatePersistentStructure(Generation.java:480)

[ddgen] at com.sap.dictionary.tools.generation.console.GenerationConsole.generate(GenerationConsole.java:168)

[ddgen] at com.sap.dictionary.generation.ant.GenerationAnt.main(GenerationAnt.java:47)

[ddgen] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

[ddgen] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java(Compiled Code))

[ddgen] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java(Compiled Code))

[ddgen] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java(Compiled Code))

[ddgen] at java.lang.reflect.Method.invoke(Method.java(Compiled Code))

[ddgen] at com.sap.dictionary.generation.ant.DDGenAntTask.execute(DDGenAntTask.java:219)

[ddgen] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)

[ddgen] at org.apache.tools.ant.Task.perform(Task.java:364)

[ddgen] at org.apache.tools.ant.Target.execute(Target.java:341)

[ddgen] at org.apache.tools.ant.Target.performTasks(Target.java:369)

[ddgen] at org.apache.tools.ant.Project.executeTarget(Project.java:1214)

[ddgen] at com.sap.tc.buildplugin.techdev.ant.util.AntRunner.run(AntRunner.java:116)

[ddgen] at com.sap.tc.buildplugin.DefaultAntBuildAction.execute(DefaultAntBuildAction.java:59)

[ddgen] at com.sap.tc.buildplugin.DefaultPlugin.handleBuildStepSequence(DefaultPlugin.java:214)

[ddgen] at com.sap.tc.buildplugin.DefaultPlugin.performBuild(DefaultPlugin.java:186)

[ddgen] at com.sap.tc.buildplugin.DefaultPluginV3Delegate$BuildRequestHandler.handle(DefaultPluginV3Delegate.java:66)

[ddgen] at com.sap.tc.buildplugin.DefaultPluginV3Delegate.requestV3(DefaultPluginV3Delegate.java:48)

[ddgen] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

[ddgen] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java(Compiled Code))

[ddgen] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java(Compiled Code))

[ddgen] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java(Compiled Code))

[ddgen] at java.lang.reflect.Method.invoke(Method.java(Compiled Code))

[ddgen] at com.sap.tc.buildtool.v2.impl.PluginHandler2.maybeInvoke(PluginHandler2.java:350)

[ddgen] at com.sap.tc.buildtool.v2.impl.PluginHandler2.request(PluginHandler2.java:102)

[ddgen] at com.sap.tc.buildtool.v2.impl.PluginHandler2.build(PluginHandler2.java:76)

[ddgen] at com.sap.tc.buildtool.PluginHandler2Wrapper.execute(PluginHandler2Wrapper.java:58)

[ddgen] at com.sap.tc.devconf.impl.DCProxy.make(DCProxy.java:1750)

[ddgen] at com.sap.tc.devconf.impl.DCProxy.make(DCProxy.java:1515)

[ddgen] at com.sap.tc.buildcontroller.CBSBuildController.build(CBSBuildController.java:761)

[ddgen] at com.sap.tc.buildcontroller.CBSBuildController.execCommand(CBSBuildController.java:527)

[ddgen] at com.sap.tc.buildcontroller.CBSBuildController.evalCmdLine(CBSBuildController.java:452)

[ddgen] at com.sap.tc.buildcontroller.CBSBuildController.run(CBSBuildController.java:324)

[ddgen] at com.sap.tc.buildcontroller.CBSBuildController.exec(CBSBuildController.java:262)

[ddgen] at com.sap.tc.buildcontroller.CBSBuildController.mainLoop(CBSBuildController.java:217)

[ddgen] at com.sap.tc.buildcontroller.CBSBuildController.main(CBSBuildController.java:178)

[ddgen] ERROR: Unknown exception during generation null (com.sap.dictionary.generation.ant.GenerationAntTaskError)

[ddgen] ERROR: Generation failed due to errors (2 seconds)

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