It cannot file the specified file on the media server. It should be there, a quick look with Windows Explorer will tell you. If it is there, then check the permissions. If it isn't then un-install & re-install the IDR option.
I would like to know if you have performed the above mentioned steps. In addition to that, you may also like to refer the following Technote :
"\\IDR\Disk4\bedrwiz.ini not found in the image" appears during the creation of the Intelligent Disaster Recovery (IDR) bootable image http://support.veritas.com/docs/242779
Please let us know if the above helped you resloving the issue. Should the issue persist, please revert with the latest updates.