Error number 4001 in 4: Error while parsing velocity page 
Wrapped Exception: Invocation of method 'getAttachmentURL' in  class com.xpn.xwiki.api.Document threw exception class java.lang.NullPointerException : 
com.xpn.xwiki.XWikiException: Error number 4001 in 4: Error while parsing velocity page 
Wrapped Exception: Invocation of method 'getAttachmentURL' in  class com.xpn.xwiki.api.Document threw exception class java.lang.NullPointerException : 
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:152)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1039)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:991)
	at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:310)
	at sun.reflect.GeneratedMethodAccessor53.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:267)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:197)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:175)
	at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:220)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
	at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:172)
	at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:114)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:244)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:146)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1017)
	at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:98)
	at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:155)
	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)


Wrapped Exception:

java.lang.NullPointerException: 
	at com.xpn.xwiki.web.XWikiServletURLFactory.createAttachmentURL(XWikiServletURLFactory.java:286)
	at com.xpn.xwiki.doc.XWikiDocument.getAttachmentURL(XWikiDocument.java:505)
	at com.xpn.xwiki.api.Document.getAttachmentURL(Document.java:216)
	at sun.reflect.GeneratedMethodAccessor84.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:267)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:197)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:175)
	at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:327)
	at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:51)
	at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:95)
	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:55)
	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:70)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:244)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:146)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1039)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:991)
	at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:310)
	at sun.reflect.GeneratedMethodAccessor53.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:267)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:197)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:175)
	at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:220)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
	at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:172)
	at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:114)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:244)

Error number 4001 in 4: Error while parsing velocity page 
Wrapped Exception: Invocation of method 'getAttachmentURL' in  class com.xpn.xwiki.api.Document threw exception class java.lang.NullPointerException : 
com.xpn.xwiki.XWikiException: Error number 4001 in 4: Error while parsing velocity page 
Wrapped Exception: Invocation of method 'getAttachmentURL' in  class com.xpn.xwiki.api.Document threw exception class java.lang.NullPointerException : 
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:152)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1039)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:991)
	at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:310)
	at sun.reflect.GeneratedMethodAccessor53.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:267)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:197)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:175)
	at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:220)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
	at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:172)
	at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:114)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:244)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:146)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1017)
	at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:98)
	at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:155)
	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)


Wrapped Exception:

java.lang.NullPointerException: 
	at com.xpn.xwiki.web.XWikiServletURLFactory.createAttachmentURL(XWikiServletURLFactory.java:286)
	at com.xpn.xwiki.doc.XWikiDocument.getAttachmentURL(XWikiDocument.java:505)
	at com.xpn.xwiki.api.Document.getAttachmentURL(Document.java:216)
	at sun.reflect.GeneratedMethodAccessor84.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:267)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:197)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:175)
	at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:220)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:244)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:146)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1039)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:991)
	at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:310)
	at sun.reflect.GeneratedMethodAccessor53.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:267)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:197)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:175)
	at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:220)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
	at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:172)
	at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:114)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:244)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:146)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1017)
	at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:98)
	at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:155)