Configuration is invalid in the .xml configuration

[willgss]

The following is my .xml configuration:
<ehcache:config
xmlns:ehcache="http://www.ehcache.org/v3"

<ehcache:persistence directory="./tmp/Ehcache3"/>
<ehcache:cache-template name="template">
    <!--        <key-type>java.lang.String</key-type>-->
    <!--        <value-type>java.lang.String</value-type>-->
    <ehcache:expiry>

        <ehcache:ttl>10</ehcache:ttl>
        **<ehcache:tti>10</ehcache:tti>**
    </ehcache:expiry>

    <ehcache:resources>

        <ehcache:heap>100</ehcache:heap>
        <ehcache:offheap unit="MB">5</ehcache:offheap>
        <ehcache:disk unit="MB">1024</ehcache:disk>
    </ehcache:resources>
</ehcache:cache-template>

<ehcache:cache alias="indexArticleList" uses-template="template">
</ehcache:cache>

</ehcache:config>

the following is part of the error when i try to start my service:

Caused by: org.ehcache.xml.exceptions.XmlConfigurationException: Error parsing XML configuration at file:/C:/Java_Projects/micro-service-tpm-updateToJava21/service/target/classes/ehcache.xml
at org.ehcache.xml.XmlConfiguration.(XmlConfiguration.java:126)
at org.ehcache.xml.XmlConfiguration.(XmlConfiguration.java:92)
at org.ehcache.jsr107.EhcacheCachingProvider$ConfigSupplier.getConfiguration(EhcacheCachingProvider.java:328)
... 127 common frames omitted
Caused by: org.xml.sax.SAXParseException: cvc-complex-type.2.4.d: Invalid content was found starting with element 'ehcache:tti'. No child element is expected at this point.
at java.xml/com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:204)
at java.xml/com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:135)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:396)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:284)
at java.xml/com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(XMLSchemaValidator.java:512)
at java.xml/com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.reportSchemaError(XMLSchemaValidator.java:3596)
at java.xml/com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:1989)
at java.xml/com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:830)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:376)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2726)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:605)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:114)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:542)
at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:889)
at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:825)
at java.xml/com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
at java.xml/com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:247)
at java.xml/com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:342)
at java.xml/javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:178)
at org.ehcache.xml.ConfigurationParser.uriToDocument(ConfigurationParser.java:225)
at org.ehcache.xml.XmlConfiguration.(XmlConfiguration.java:117)
... 129 common frames omitted

also the Intelij IDE reminds me that the line for tti is invalid, but it is ok when i only have under the . It seems i can only have one item under , i do not know why. What should i do if i need to config both ttl and tti?
Thank you !