I've been struggling with this issue for a while and trying it again with every new Release and hoping it's been solved. By the current release, unfortunately not!
@smartBear: Ist there any hope that this well known issue will be solved:
can ReadyAPI be inproved to handle xlsx file in groovy script or should will exclude that combination from test cases implementation at all.
Please try the solution from this article:
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I am also stuck with this issue, any pro or @Nastya_Khovrina have any ideas, please tell me, But my solution is changing .xlsx to xls, it does work. But I want to use .xlsx instead of .xls file.