What is the error ?
thank you for the reply (Received a list of OVFError) this error appear after 3 seconds like pop-ups
Check the VM doesn't have an ISO mounted against the CDROM. If it does then set this to client device and then re-attempt to export OVF files.
I believe this issues happens when the OVF export utility tries to get the ISO file attached to the CDROM but is unable to find the file in the location specified. This could be because the VM has been moved to a location where the attached ISO file isn't available OR the ISO is no longer available in the location specified.