This apppears to be a bug in WASCE 1.0.1.1. They've picked up a version of the console app code that uses commons-io 1.2 but they've packaged commons-io 1.0 with the console app. If you download commons-io 1.2 and replace the version that's there then the problem goes away.Here are the steps that worked for me.
Backup the file commons-io-1.0.jar (by renaming it or moving it to another folder) that in the following folder
<WASCE_HOME>\config-store\21\geronimo-console-standard-1.0.war\WEB-INF\lib
Download commons-io 1.2 from here http://jakarta.apache.org/site/downloads/downloads_commons-io.cgi
Copy the jar file commons-io-1.2.jar to
<WASCE_HOME>\config-store\21\geronimo-console-standard-1.0.war\WEB-INF\lib
Rename it to commons-io-1.0.jar and restart the server
