throwing could not execute statement ,sqlcode = 5123 severity level =16

hi all,

I am able to take dump/load of DB. When i am trying to make disk device ,server is throwing error "could not execute statement ,sqlcode = 5123 severity level =16."

My ASE version is :

Adaptive Server Enterprise/16.0 GA PL01/EBF 22540 SMP/P/X64/Windows Server/ase160sp00pl01/3523/64-bit/FBO/Tue Apr 15 19:04:17 2014

I know this is related to permission issue.But i have tried it ,no possible to overcome this in my machine.I need suggestion & help here .

Thanks in Advance.