Splitter in Mule 3.2

I'm using a splitter in a Mule flow, as described on the answer to this question:

Mule splitter using regex returned no results

However, when I try to do something similar on Mule 3.2, I get the following error:

Line 27 in XML document from URL [file:/...] is invalid; nested exception is org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'expression-language'. One of '{"http://ift.tt/1atROtw":annotations, "http://ift.tt/1atROtw":default-threading-profile, "http://ift.tt/1atROtw":default-dispatcher-threading-profile, "http://ift.tt/1atROtw":default-receiver-threading-profile, "http://ift.tt/1atROtw":default-service-threading-profile, "http://ift.tt/1atROtw":abstract-reconnection-strategy}' is expected. (org.mule.api.lifecycle.InitialisationException)

So, my questions are: Can the following element be used in Mule 3.2? And if not, which is the correct way to do it in that version?

<configuration>
    <expression-language autoResolveVariables="false">
        <import class="org.mule.util.StringUtils" />
    </expression-language>
</configuration>