Hi Omkar,
we encounter such issues. please do as below to resolve it . Hope the datasource is 3.x.
1. You try to compress all the requests . There are chances for this error if your F table is huge.
2. Delete indexes of the cube before loading.
3. If the error occurs--> Go to the Monitor screen --> settings for further update
4. Edit--> Update/Reversal --> read every thing manually
Hope it helps.
regards,
Sudhir