unable to resolve class com.atlassian.crowd.model.user.User with the scriptrunner 3.0.6

[Aret Boduryan]

// With the following code

if (it instanceof com.atlassian.crowd.model.user.User) {  <-- ERROR             
   it.firstName +" "+ it.lastName +" ("+it.name+")"              
} else {                 
   it             
}

// I am receiving the following error with the scriptrunner 3.0.6

unable to resolve class com.atlassian.crowd.model.user.User

// my imports are:

import com.atlassian.crowd.embedded.api.User

import com.atlassian.jira.component.ComponentAccessor

import com.atlassian.jira.config.properties.APKeys

import com.atlassian.jira.config.properties.ApplicationProperties

import com.atlassian.jira.issue.CustomFieldManager

import com.atlassian.jira.issue.Issue

import com.atlassian.jira.issue.IssueManager

import com.atlassian.jira.issue.MutableIssue

import com.atlassian.jira.issue.fields.CustomField

import com.atlassian.jira.issue.watchers.WatcherManager

import com.atlassian.jira.security.groups.GroupManager

import com.atlassian.jira.security.roles.ProjectRole

import com.atlassian.jira.security.roles.ProjectRoleManager

import com.atlassian.jira.user.util.UserUtil

import com.atlassian.jira.user.UserUtils

import com.atlassian.mail.Email

import com.atlassian.mail.MailException

import com.atlassian.mail.MailFactory

import com.atlassian.mail.queue.SingleMailQueueItem

import com.atlassian.mail.server.MailServerManager

import com.atlassian.mail.server.SMTPMailServer

import com.onresolve.scriptrunner.canned.jira.utils.ConditionUtils

import com.opensymphony.workflow.WorkflowContext

import groovy.text.GStringTemplateEngine import org.apache.log4j.Category

import org.ofbiz.core.entity.GenericValue

// QUESTION

How can I get rid of this error?

[Aret Boduryan]

I am not able to reproduce the error in script console because 

of another error before reaching the codeline with instanceof ... 

No such property: transientVars for class: SendPreDeliveryMail

groovy.lang.MissingPropertyException: No such property: transientVars for class: SendPreDeliveryMail at SendPreDeliveryMail.run(SendPreDeliveryMail.groovy:370)

[JamieA]

that's understandable, but you can test it with just that single import as the entire script.

[Aret Boduryan]

No This is not inside an email teplate. It is a post function configured in a specific state transition. This function was working perfectly with JIRA 6.1 and the old version (2.1.16) of scriptrunner. 

[JamieA]

Can you reproduce this in the script console? Or is it specifically in post-functions?

[JamieA]

Is this in an email template? I don't think you can do imports with GStringTemplateEngine.

[Aret Boduryan]

JIRA version is 6.3.1

[JamieA]

what jira version?