Reindexing throws NullPointer Exception, liferay 5.2.4 version, supporting, ie cannot display, web page, browser stops support, liferay, systemhook, 6

Pooja P Joshi	:	Hi All,
		We are facing one Re-indexing issue. we are using Liferay 5.2.4 version When I do Re-indexing from control panel, after some time browser stops supporting and it shows "IE cannot display the web page".
		Tomcat Error logs are as below:
		09:36:17,706 ERROR [FileSystemHook:262] Reindexing DLFE-1630.doc
		java.lang.NullPointerException
		at com.liferay.documentlibrary.util.FileSystemHook.reIndex(FileSystemHook.java:258)
		at com.liferay.documentlibrary.util.Indexer.reIndex(Indexer.java:317)
		at com.liferay.documentlibrary.service.impl.DLServiceImpl.reIndex(DLServiceImpl.java:180)
		at sun.reflect.GeneratedMethodAccessor758.invoke(Unknown Source)
		at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
		at java.lang.reflect.Method.invoke(Method.java:597)
		at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
		at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:
		at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
		at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
		at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
		at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
		at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
		at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
		at $Proxy122.reIndex(Unknown Source)
		at com.liferay.portlet.documentlibrary.service.impl.DLFolderLocalServiceImpl.reIndex(DLFolderLocalServiceImpl.ja
		va:415)
		at sun.reflect.GeneratedMethodAccessor1246.invoke(Unknown Source)
		at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
		at java.lang.reflect.Method.invoke(Method.java:597)
		at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
		at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java: 182)
		at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
		at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
		at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
		at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
		at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
		at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
		at $Proxy119.reIndex(Unknown Source)
		at com.liferay.portlet.documentlibrary.service.DLFolderLocalServiceUtil.reIndex(DLFolderLocalServiceUtil.java:28
		Any idea what could be the reason for this? Any solution?
		Thanks, -Pooja
Mazhar Anwar	:	It seems you have some entries in your_portal/data/document_libraray/(Your Document repository folder) folder and respective entries are not there in DLFileentry Table.
		You can either delete /data/document_libraray/DLFE-1630.doc folder or create respective entries in DLFileEntry Table.