Error while using in Kaleo

Error while using in Kaleo

I want to create a multiple approver workflow definition xml file.
I have created the below xml file.
<workflow-definition xmlns="urn:liferay.com:liferay-workflow_6.1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="urn:liferay.com:liferay-workflow_6.1.0
http://www.liferay.com/dtd/liferay-workflow-definition_6_1_0.xsd">
<name>Multiple Approvers</name>
<description>A multiple approvers can approve a workflow content two
approvals - parallel.</description>
<version>1</version>
<state>
<name>created</name>
<metadata>
<![CDATA[{"xy":[36,51]}]]>
</metadata>
<initial>true</initial>
<transitions>
<transition>
<name>review</name>
<target>review</target>
</transition>
</transitions>
</state>
<task>
<name>update</name>
<metadata>
<![CDATA[{"xy":[397,191]}]]>
</metadata>
<actions>
<notification>
<name>Creator Modification Notification</name>
<template>Your submission was rejected by a reviewer, please
modify and resubmit.</template>
<template-language>text</template-language>
<notification-type>email</notification-type>
<execution-type>onAssignment</execution-type>
</notification>
</actions>
<assignments>
<user />
</assignments>
<transitions>
<transition>
<name>resubmit</name>
<target>review</target>
</transition>
</transitions>
</task>
<fork>
<name>review</name>
<transitions>
<transition>
<name>managerreview</name>
<target>managerreview</target>
</transition>
<transition>
<name>vpreview</name>
<target>vpreview</target>
</transition>
</transitions>
</fork>
<task>
<name>vpreview</name>
<metadata>
<![CDATA[{"xy":[225,45]}]]>
</metadata>
<actions>
<notification>
<name>Review Notification</name>
<template>You have a new submission waiting for your review in
the workflow.</template>
<template-language>text</template-language>
<notification-type>email</notification-type>
<execution-type>onAssignment</execution-type>
</notification>
<notification>
<name>Review Completion Notification</name>
<template>
Your submission has been reviewed and the reviewer has
applied the following ${taskComments}.</template>
<template-language>freemarker</template-language>
<notification-type>email</notification-type>
<recipients>
<user />
</recipients>
<execution-type>onExit</execution-type>
</notification>
</actions>
<assignments>
<roles>
<role>
<role-type>regular</role-type>
<name>Portal Content Reviewer</name>
</role>
<role>
<role-type>regular</role-type>
<name>HR-VP</name>
</role>
<role>
<role-type>regular</role-type>
<name>Finance-VP</name>
</role>
</roles>
</assignments>
<transitions>
<transition>
<name>approve</name>
<target>approved</target>
</transition>
<transition>
<name>reject</name>
<target>update</target>
<default>false</default>
</transition>
</transitions>
</task>
<task>
<name>managerreview</name>
<metadata>
<![CDATA[{"xy":[225,45]}]]>
</metadata>
<actions>
<notification>
<name>Review Notification</name>
<template>You have a new submission waiting for your review in
the workflow.</template>
<template-language>text</template-language>
<notification-type>email</notification-type>
<execution-type>onAssignment</execution-type>
</notification>
<notification>
<name>Review Completion Notification</name>
<template>
Your submission has been reviewed and the reviewer has
applied the following ${taskComments}.</template>
<template-language>freemarker</template-language>
<notification-type>email</notification-type>
<recipients>
<user />
</recipients>
<execution-type>onExit</execution-type>
</notification>
</actions>
<assignments>
<roles>
<role>
<role-type>regular</role-type>
<name>Portal Content Reviewer</name>
</role>
<role>
<role-type>regular</role-type>
<name>Finance-Manager</name>
</role>
<role>
<role-type>regular</role-type>
<name>HR-Manager</name>
</role>
</roles>
</assignments>
<transitions>
<transition>
<name>approve</name>
<target>approved</target>
</transition>
<transition>
<name>reject</name>
<target>update</target>
<default>false</default>
</transition>
</transitions>
</task>
<join>
<name>approved</name>
<transitions>
<transition>
<name>result</name>
<target>done</target>
<default>true</default>
</transition>
</transitions>
</join>
<state>
<name>done</name>
<metadata>
<![CDATA[{"xy":[422,56]}]]>
</metadata>
<actions>
<action>
<name>approve</name>
<script>
<![CDATA[
Packages.com.liferay.portal.kernel.workflow.WorkflowStatusManagerUtil.updateStatus(Packages.com.liferay.portal.kernel.workflow.WorkflowConstants.toStatus("approved"),
workflowContext);
]]>
</script>
<script-language>javascript</script-language>
<execution-type>onEntry</execution-type>
</action>
</actions>
</state>
I uploaded in Control Panel -> Workflow -> Definitions -> Add -> New
Workflow Definition.
An error occurred in the workflow engine as below

Please guide me to solve this error.
Thanks in advance.
Regards, Dinesh