System error clicking on view change

Clicked on view change on http://confluence.atlassian.com/display/CONFEXT/Calendar+Plugin

Cause:
Invocation of method 'hasPreviousVersion' in class com.atlassian.confluence.pages.actions.DiffPagesAction threw exception class java.util.NoSuchElementException : null

Stack Trace: [hide]

Invocation of method 'hasPreviousVersion' in class com.atlassian.confluence.pages.actions.DiffPagesAction threw exception class java.util.NoSuchElementException : null

Referer URL: http://confluence.atlassian.com/display/CONFEXT/Calendar+Plugin

Build Information:
Confluence Home: /opt/java/src/confluence/deployments/conf.atlassian.com/home
Uptime: 5 days, 3 hours, 36 minutes, 45 seconds
Version: 2.0
Build Number: 320

Server Information:
Application Server: Orion/2.0.2
Servlet Version: 2.2
Database Dialect: net.sf.hibernate.dialect.PostgreSQLDialect

Memory Information:
Total Memory: 494 MB
Free Memory: 189 MB
Used Memory: 305 MB

System Information:
System Date: Monday, 21 Nov 2005
System Time: 16:10:01
System Favourite Colour: Chartreuse
Java Version: 1.4.2_04
Java Vendor: Sun Microsystems Inc.
JVM Version: 1.0
JVM Vendor: Sun Microsystems Inc.
JVM Implementation Version: 1.4.2_04-b05
Java Runtime: Java(TM) 2 Runtime Environment, Standard Edition
Java VM: Java HotSpot(TM) Server VM
User Name: j2ee
User Timezone: America/Chicago
Operating System: Linux 2.4.21-37.ELsmp
OS Architecture: i386
Request

Information:
URL: http://atlassian01.contegix.com:10082/500page.jsp

• Scheme: http
• Server: atlassian01.contegix.com
• Port: 10082
• URI: /500page.jsp
• - Context Path:
• - Servlet Path: /500page.jsp
• - Path Info: null
• - Query String: pageId=133982&originalId=144489

Attributes:

• javax.servlet.error.exception : org.apache.velocity.exception.MethodInvocationException: Invocation of method 'hasPreviousVersion' in class com.atlassian.confluence.pages.actions.DiffPagesAction threw exception class java.util.NoSuchElementException : null
• javax.servlet.error.message : Invocation of method 'hasPreviousVersion' in class com.atlassian.confluence.pages.actions.DiffPagesAction threw exception class java.util.NoSuchElementException : null
• os_securityfilter_already_filtered : true
• com.atlassian.johnson.filters.JohnsonFilter_already_filtered : true
• javax.servlet.error.request_uri : /pages/diffpages.action
• javax.servlet.error.status_code : 500
• os_authstatus : null
• _sitemesh_filterapplied : true
• javax.servlet.error.servlet_name : action
• webwork.valueStack : com.opensymphony.xwork.util.OgnlValueStack@65e8b2
• loginfilter.already.filtered : true
• atlassian.core.seraph.original.url : /pages/diffpages.action?pageId=133982&originalId=144489
• javax.servlet.jsp.jspException : org.apache.velocity.exception.MethodInvocationException: Invocation of method 'hasPreviousVersion' in class com.atlassian.confluence.pages.actions.DiffPagesAction threw exception class java.util.NoSuchElementException : null
• sessioninview.FILTERED : true
• com.atlassian.core.filters.gzip.GzipFilter_already_filtered : true

Parameters:

• originalId = 144489
• pageId = 133982

Logging:
2 log statements generated by this request:
[ERROR] Mon Nov 21 16:10:01 CST 2005 [com.opensymphony.webwork.dispatcher.VelocityResult] Unable to render Velocity Template, '/pages/diffpages.vm'
Throwable:
org.apache.velocity.exception.MethodInvocationException: Invocation of method 'hasPreviousVersion' in class com.atlassian.confluence.pages.actions.DiffPagesAction threw exception class java.util.NoSuchElementException : null
at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:309)
at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:207)
at org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReference.java:337)
at org.apache.velocity.runtime.parser.node.ASTExpression.evaluate(ASTExpression.java:84)
at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:107)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:94)
at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:109)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:94)
at com.atlassian.confluence.setup.velocity.ApplyDecoratorDirective.render(ApplyDecoratorDirective.java:162)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:153)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:271)
at org.apache.velocity.Template.merge(Template.java:296)
at com.opensymphony.webwork.dispatcher.VelocityResult.doExecute(VelocityResult.java:91)
at bucket.util.profiling.ProfiledVelocityResult.doExecute(ProfiledVelocityResult.java:18)
at com.opensymphony.webwork.dispatcher.WebWorkResultSupport.execute(WebWorkResultSupport.java:116)
at com.opensymphony.xwork.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:263)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:187)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
[ERROR] Mon Nov 21 16:10:01 CST 2005 [com.opensymphony.webwork.dispatcher.ServletDispatcher] Could not execute action
Throwable:
org.apache.velocity.exception.MethodInvocationException: Invocation of method 'hasPreviousVersion' in class com.atlassian.confluence.pages.actions.DiffPagesAction threw exception class java.util.NoSuchElementException : null
at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:309)
at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:207)
at org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReference.java:337)
at org.apache.velocity.runtime.parser.node.ASTExpression.evaluate(ASTExpression.java:84)
at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:107)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:94)
at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:109)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:94)
at com.atlassian.confluence.setup.velocity.ApplyDecoratorDirective.render(ApplyDecoratorDirective.java:162)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:153)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:271)
at org.apache.velocity.Template.merge(Template.java:296)
at com.opensymphony.webwork.dispatcher.VelocityResult.doExecute(VelocityResult.java:91)
at bucket.util.profiling.ProfiledVelocityResult.doExecute(ProfiledVelocityResult.java:18)
at com.opensymphony.webwork.dispatcher.WebWorkResultSupport.execute(WebWorkResultSupport.java:116)
at com.opensymphony.xwork.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:263)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:187)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)