Read Excel file with Groovy code works with SOAPUI free version but not with the Ready API

I believe that you should be able to access the excel file in ReadyAPI out-of-the-box. i.e., you should be able to run the data driven tests easily than to the open source edition.

Please see documentaion.

http://readyapi.smartbear.com/structure/sources/excel/introduction

So, the libraries must already be available in its lib directory. May not required to copy them under ReadyAPI-<version>/bin/ext directory. They could even conflicting. Remove them and try above documentation. Or try the groovy script that you had in Open Source edition directly if you want and that should be working without additional libraries.