ModuleSet Binaries does not support <attachmentClassifier> tag

"Embedded error: Unrecognised tag: 'attachmentClassifier' " errors occur when the <attachmentClassifier> tag is specified for ModuleSet Binaries. The part of the script that was producing this error is as follows;

<moduleSet>
<includes>
<include>transformer:transformer-gui</include>
</includes>
<binaries>
<attachmentClassifier>bin</attachmentClassifier>
<outputDirectory>binaries</outputDirectory>
</binaries>
</moduleSet>