FILE SYSTEM - successful and failed

HI All,

SAP BO 4.1 SP7

Im getting this error when scheduling webi report to a destination in my linux system

error - destination directory error. [Permission denied]: [CrystalEnterprise.DiskUnmanaged] 

First report runs successfully and the next failed  with the above error.

Schedule the first report again and it failed.

Webi job server is setup with the destination directory.

Any solution

Thanks

JS