Get velocity warning during upgrade of the attached data

Importing the attached data from 3.7.2 will cause admin's subscription to be updated. This will triggger sending off an email. However, I get the following Velocity warning messages.

2008-11-11 20:41:10,665 Sending mailitem com.atlassian.jira.upgrade.tasks.UpgradeTask_Build232MailItem@57d70b2b WARN [velocity] org.apache.velocity.runtime.exception.ReferenceException: reference : template = templates/email/text/lossysubscriptionconversion.vm [line 10,column 83] : ${sub.subscriptionId} is not a valid reference.
at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:277)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:55)
at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:166)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:114)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
at org.apache.velocity.Template.merge(Template.java:256)
at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:450)
at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:77)
at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:61)
at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:56)
at com.atlassian.jira.upgrade.tasks.UpgradeTask_Build232MailItem.send(UpgradeTask_Build232MailItem.java:67)
at com.atlassian.mail.queue.MailQueueImpl.sendBuffer(MailQueueImpl.java:68)
at com.atlassian.jira.service.services.mail.MailQueueService.run(MailQueueService.java:23)
at com.atlassian.jira.service.JiraServiceContainerImpl.run(JiraServiceContainerImpl.java:56)
at com.atlassian.jira.service.ServiceRunner.execute(ServiceRunner.java:61)
at org.quartz.core.JobRunShell.run(JobRunShell.java:191)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:516)

2008-11-11 20:41:10,669 Sending mailitem com.atlassian.jira.upgrade.tasks.UpgradeTask_Build232MailItem@57d70b2b WARN [velocity] org.apache.velocity.runtime.exception.ReferenceException: reference : template = templates/email/text/lossysubscriptionconversion.vm [line 10,column 114] : ${sub.filterId} is not a valid reference.
at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:277)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:55)
at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:166)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:114)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
at org.apache.velocity.Template.merge(Template.java:256)
at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:450)
at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:77)
at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:61)
at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:56)
at com.atlassian.jira.upgrade.tasks.UpgradeTask_Build232MailItem.send(UpgradeTask_Build232MailItem.java:67)
at com.atlassian.mail.queue.MailQueueImpl.sendBuffer(MailQueueImpl.java:68)
at com.atlassian.jira.service.services.mail.MailQueueService.run(MailQueueService.java:23)
at com.atlassian.jira.service.JiraServiceContainerImpl.run(JiraServiceContainerImpl.java:56)
at com.atlassian.jira.service.ServiceRunner.execute(ServiceRunner.java:61)
at org.quartz.core.JobRunShell.run(JobRunShell.java:191)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:516)

2008-11-11 20:41:10,681 Sending mailitem com.atlassian.jira.upgrade.tasks.UpgradeTask_Build232MailItem@57d70b2b WARN [velocity] org.apache.velocity.runtime.exception.ReferenceException: reference : template = templates/email/text/lossysubscriptionconversion.vm [line 11,column 72] : ${sub.oldPrettyInterval} is not a valid reference.
at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:277)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:55)
at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:166)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:114)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
at org.apache.velocity.Template.merge(Template.java:256)
at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:450)
at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:77)
at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:61)
at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:56)
at com.atlassian.jira.upgrade.tasks.UpgradeTask_Build232MailItem.send(UpgradeTask_Build232MailItem.java:67)
at com.atlassian.mail.queue.MailQueueImpl.sendBuffer(MailQueueImpl.java:68)
at com.atlassian.jira.service.services.mail.MailQueueService.run(MailQueueService.java:23)
at com.atlassian.jira.service.JiraServiceContainerImpl.run(JiraServiceContainerImpl.java:56)
at com.atlassian.jira.service.ServiceRunner.execute(ServiceRunner.java:61)
at org.quartz.core.JobRunShell.run(JobRunShell.java:191)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:516)

2008-11-11 20:41:10,686 Sending mailitem com.atlassian.jira.upgrade.tasks.UpgradeTask_Build232MailItem@57d70b2b WARN [velocity] org.apache.velocity.runtime.exception.ReferenceException: reference : template = templates/email/text/lossysubscriptionconversion.vm [line 12,column 74] : ${sub.newCronTrigger} is not a valid reference.
at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:277)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:55)
at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:166)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:114)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
at org.apache.velocity.Template.merge(Template.java:256)
at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:450)
at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:77)
at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:61)
at com.atlassian.velocity.DefaultVelocityManager.getEncodedBody(DefaultVelocityManager.java:56)
at com.atlassian.jira.upgrade.tasks.UpgradeTask_Build232MailItem.send(UpgradeTask_Build232MailItem.java:67)
at com.atlassian.mail.queue.MailQueueImpl.sendBuffer(MailQueueImpl.java:68)
at com.atlassian.jira.service.services.mail.MailQueueService.run(MailQueueService.java:23)
at com.atlassian.jira.service.JiraServiceContainerImpl.run(JiraServiceContainerImpl.java:56)
at com.atlassian.jira.service.ServiceRunner.execute(ServiceRunner.java:61)
at org.quartz.core.JobRunShell.run(JobRunShell.java:191)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:516)

The e-mails then contain some unresolved velocity references.