Hi,
Any changes happend to particular cube ?
and also one more clarification which step you are using in process chain ?
I mean roll up or compression?
If its a less number of data records please do try to do delete entire content of data and try to do roll up and then compression.
Because i feel if you have done compression first : data will move to E table, after moving data to E table rollup it won't work i think.
If its useful my answer please accept if not leave it.
Regards,
Satya.