Using Web design API to export to CSV

I was following the instructions in the How to Export Data from Visual Composer and I couldn't finish the second part, chapter 3.2 Using Web design API to export to CSV, it deploys but when I try to click on the button to Export to CSV I see the following error message:
Exception in BI runtime
The metadata of "ITE" "CHART_ITEM" are incorrect for parameter "LEGEND_ONLY"
Initial cause
Message:
No message was provided.
And it lists several lines of java.lang.nullpointer exception.
Did some of you had the same problem?
What does this error mean?
Thank you,

Hey,
Sorry. Probably should have explained this in the how to guide. BEx Web must be setup according to OSS Note 917950 and this presentation:
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/media/uuid/2421b12f-0c01-0010-d385-a0f972a25350
Your particular error is addressed by OSS Note: 924312
Cheers,
Prakash

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