there may be multiple causes of this error. I believe I ran into this error on desktop when trying to use a parameter directly applied within the color shelf. As a workaround, I put the parameter into a calc field and then applied the calc onto the color shelf.
Are you doing anything within here related to parameters?
I would suggest that you contact our support team regarding this issue. We have seen cases like this in the past. Sometimes it has been caused by trying to use a parameter directly to color fields. In this case, the problem was solved by creating a calc that referenced the parameter and then the calc was put onto the color shelf.
Feel free to email the team at firstname.lastname@example.org
Did you find any answer for the issue you had reported?
I am getting the same error while exporting the report as crosstab.
Any help will be appreciated.