Dynamic filename for response message in Async-Sync without BPM

Hi All,

I am using Async sync with out BPM  in file to proxy scenario, When I tried to create Dynamic file name configuration in receiver communication channel  for the response mesage I am getting the error as

"Could not process due to error: java.io.FileNotFoundException: /xxx/yyy/zzz  (A file or directory in the path name does not exist.)" in receiver communication channel .

And the file and folder has all permissions  and without dynamic configuration the whole scenario is working fine.

When I enable Dynamic configuration I am getting above error.

Please help me on this .

PS: We are using PI 7.1

Thanks,

Akhila.A