POI

Poi error in Bonita 7.x.x

Hello, this is my first question in bonitasoft community forum, and... I dont speak english very well so I must apologise for that...
Well the question is I'm currently using bonita 6.5.3 with very good results, but with the new vertion released i'm triying to upgrade to bonita 7.x.x.
My first step was import the actual process (6.5.3) to the design enviroment and try to run the process but i'm getting stuck in an assignment that return a java.util.list as the result of reading an excel document.

The code is the next:

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