NPE "New Card"

2009-08-28 12:00:48,072 http-j2ee.jira.atlassian.com%2F127.0.0.101-8080-Processor22 ERROR lme 43248x103632x1 ax0tq8 http://jira.atlassian.com/secure/GHAddIssue.jspa [velocity] Method getDefaultDisplayValue threw exception for reference $afield in template templates/greenhopper/jira/issue/fields/assignee-create.vm at [5,46]
2009-08-28 12:00:48,072 http-j2ee.jira.atlassian.com%2F127.0.0.101-8080-Processor22 ERROR lme 43248x103632x1 ax0tq8 http://jira.atlassian.com/secure/GHAddIssue.jspa [com.atlassian.velocity.DefaultVelocityManager] MethodInvocationException occurred getting message body from Velocity: java.lang.NullPointerException
java.lang.NullPointerException
at com.pyxis.greenhopper.jira.fields.Assignee.getDefaultDisplayValue(Assignee.java:56)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:234)
at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:201)
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.ASTBlock.render(ASTBlock.java:55)
at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:70)
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 org.apache.velocity.runtime.directive.Parse.render(Parse.java:181)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:114)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:55)
at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:166)
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 org.apache.velocity.Template.merge(Template.java:256)
at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:450)