HI Pavana,
Client tools are 32 bit version & server runs on 64 bit version. As Valdrin Spahijaja suggested you need to work out with 32 bit drivers in Client machine (where Crystal Server client 2013 installed) and the same with 64 bit drivers in server (where Crystal server 2013 is installed) if both are in same machine than install 32 & 64 bit drivers on the same machine and create DSN's for both drivers with the same name and try....
For more information, please go to this path in Service Market place
Installations and Upgrades - C"SAP CRYSTAL SERVER"SAP CRYSTAL SERVER 2013
RELATED TOPICS FOR SAP CRYSTAL SERVER 2013
Thanks,
Raju