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report view error

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hi,
I m working on knowage 7.2, I created an OLAP schema as explained on the documentation

the design creation is working well, but when I acces the report I get this error

java.util.ArrayList cannot be cast to it.eng.spago.base.SourceBean


would you help me please
thanks

I joind th log file here

https://www.knowage-suite.com/qa/?qa=blob&qa_blobid=16779531612643238829

Environment knowage 7.2 on windows server,
in OLAP and What-If by (810 points)

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