<list id="listFoo" interface="org.wrong.package.Class" cardinality="0..N"/>

If the interface doesn't exist, the error message is:
The property value 'org.wrong.package.Class', specified in the definition of bean 'listFoo', could not be converted to the required type 'class [Ljava.lang.Class;'.

It took me a while to figure out that I entered the wrong interface.