Problem in uploading it return

Ashok kumar (CA Final) (587 Points)

12 February 2013  

Dear Friends,

when i was uploading revised return for my company, Digital signature has been signed properly but i got message as "Invalid Digital Signature contact your Digital Signature Provider"

Digital Signature = Manager of the company (the same was utilized when uploading original return) the same has validity upto 2014 december

what are the possible errors incurred ?

please help me in this regards