slicers return MdxScript error when sharing file

[GeorgeGiannakis]

Hello community,
Hope you are well.
I created a report using DAX and PowerPivot. This report , along with all the reference files used at it, are locally saved at my computer.
There is no problem with the behavior of the report when I use it (for example filters/slicers work perfectly).
However, after sending a copy of the report to two users, one internal and the other one external, both of them reported the same below error.
I have to mention at this point that I have not created any DAX measure that uses COUNT, so I don't understand this error at all.
Could you please advise on what could potentially cause this behavior and what is the best method to share reports that are based to local sources?

Thank you,
George