Enter Views > XML in Issues Navigator page ,there is a error showed like this:
An error occurred whilst rendering this message. Please contact the administrators, and inform them of this bug. Details: ------- org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getCustomFieldXML' in class com.atlassian.jira.issue.views.IssueXMLView threw exception java.lang.NoSuchMethodError: com.atlassian.jira.security.JiraAuthenticationContext.getUser()Lcom/opensymphony/user/User; at templates/plugins/issueviews/single-xml.vm[line 198, column 30] at org.apache.velocity.runtime.parser.node.ASTMethod.handleInvocationException(ASTMethod.java:351) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:284) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:262) at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:342) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72) at org.apache.velocity.runtime.directive.Foreach.performIteration(Foreach.java:393) at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:316) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:175) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72) at
Is this really OnDemand hosted by Atlassian, it cannot be. This is an instance which is hosted by you.
This error is because of an outdated plugin which is still refering to "opensymphony.user"which is not available any more. Update all your plugins from UPM - https://confluence.atlassian.com/display/JIRA/Managing+JIRA's+Plugins.
Get rid of incompatible plugins and remove the custom fields coming from these incompatible plugins.
I suspect the most likely cause of this issue is an incompatible plugin installed in your instance, so please ensure that all plugins are either upto date and compatible with your current version of JIRA, and if you cannot upgrade certain plugins then please disable them and reattempt the XML export again.
All the best,
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