Is anything wrong with my "SearchSelectLister"?

Im getting an error right under the SearchSelectLister dropdown on my report, here is a copy of the XML:

<module name="SearchSelectLister">
                    <param name="settingToCreate">sourcetype</param>
                    <param name="label">Host</param>
                    <param name="searchWhenChanged">False</param>
                    <param name="search">`hosts($platform$)`</param>
                    <param name="entityName">results</param>
                    <param name="searchFieldsToDisplay">
                        <list>
                            <param name="label">$platform$</param>
                            <param name="value">$platform$</param>
                        </list>
                    </param>
                    <module name="ConvertToIntention">
                        <param name="settingToConvert">sourcetype</param>
                        <param name="intention">
                            <param name="name">stringreplace</param>
                            <param name="arg">
                                <param name="sourcetype">
                                    <param name="value">$target$</param>
                                </param>
                            </param>
                        </param>

The error I get is:

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