Rule from Wiki fails?

Setup, Configuration and Use Scripts & Rules
1

hi.
the rule from the wiki to change the commonid from EN to DE does not work for me. I use OpenHAB2

To translate the commonID to german using the supplied MAP file use the following command in the rule:

var String wetter = transform("MAP","weather_de.map",wuToday.state.toString)
Important: The input variable has to be of type String!

result:
07:31:51.576 [ERROR] [.script.engine.ScriptExecutionThread] - Error during the execution of rule ‘Inline Information’: The name ‘transform(,,)’ cannot be resolved to an item or type.

so it seems like it expects “transform” itself is an item and not a command?