Expression evaluation error in rule 'apn_uiportalreportgridcolumn'

I am getting an error while using getPortalReportDataSubset function to convert a portal report to tempo report. I did it for 6 reports, other 5 were showing correct data but this one is giving the following error:

An Error Has Occurred
Expression evaluation error in rule 'XXXXX' at function 'apply' [line 9]: Error evaluating function 'apply' : Expression evaluation error in rule 'apn_uiportalreportgridcolumn' at function 'merge' [line 6]: Error evaluating function 'merge' : Only list arguments are allowed

Please help....

OriginalPostID-94024

OriginalPostID-94024

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