After scriptrunner update VersionManager.getVersionsByName returns error in Listener

[Deleted user]

JIRA 8.20.3

ScriptRunner for JIRA 6.47.0

Listener starts throwing error after scriptrunner update
for every method in com.atlassian.jira.project.version.VersionManager
///Error for strings:

def oldValue = versionManager.getVersionsByName(change["oldstring"]).first()
def newValue = versionManager.getVersionsByName(change["newstring"]).first()

[Static type checking] - Cannot find matching method
com.atlassian.jira.project.version.VersionManager#getVersionsByName(java.lang.Object). Please check if the declared type is correct and if the method exists.

Script

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.event.type.EventDispatchOption

if (event.issue.issueType.name == "Bug" || event.issue.issueType.name == "Field Issue")
{
def loggedInUser = ComponentAccessor.userManager.getUser("automation_user")
def issueManager = ComponentAccessor.getIssueManager()
def versionManager = ComponentAccessor.versionManager
def changeItems = event?.getChangeLog()?.getRelated("ChildChangeItem")
def change = changeItems.find

{ it['field']=='Origin Affects Version' }

if (change)
{
log.warn("Issue is Bug/FI and Origin Affects Version was changed. Actions applied")
def issue = issueManager.getIssueByCurrentKey(event.issue.key)
def oldValue = versionManager.getVersionsByName(change["oldstring"]).first()
def newValue = versionManager.getVersionsByName(change["newstring"]).first()
Collection affectedVersions = issue.affectedVersions as Collection

if (!affectedVersions.contains(newValue))

{affectedVersions.remove(oldValue) 
issue.setAffectedVersions(affectedVersions) issueManager.updateIssue(loggedInUser, issue, EventDispatchOption.ISSUE_UPDATED, false) }

}
}

[Sam Bartolome]

Not much into scripting, but I think the line below misses the () after versionManager

def versionManager = ComponentAccessor.versionManager

It should be as 

def versionManager = ComponentAccessor.versionManager()