Hi Srikanth,
This issue is new to me. Could you give the screen shot of the issue you are facing.
Is it a custom Fiori client or the one download from app store ?
Change the log level of the app to debug level and find more information on the issue. Alternatively you can connect your device with system and find the logs in android SDK.
Did you try with other Fiori apps? like Approve Purchase Orders
Regards, Midhun
SAP Technology RIG