Error in Power Cubes using Report datasource

[Vishnu Priya]

Hi,

I am building a power cube using report data source for the first time. I am following a user guide which asks me to create a report using a default package and use that report in the Power cube model creation. But the following error occurs after selecting the report and moving to the next step.
Error: "XQE-GEN-0018 Query Service internal error has occurred, please see the log for details."

Not able to figure out what would be the reason for the error

[Vishnu Priya]

Would like to add one more point the question. The log file generated also does not contain any logs on what went wrong, and has only the directory location and timestamp of the file