Without much more info than what you've given. Your SVMs need to have NDMP enabled on them.
vserver services ndmp show
To enable it:
vserver services ndmp on -vserver <vserver name>
Then per SVM you need to create an NDMP user for Netbackup to use:
security login create -user-or-group-name <username> -application ssh -authentication-method password -role vsadmin-backup -vserver <svmname>
vserver services ndmp generate-password -vserver svm_netapp_dev -user <username>
Copy the generated password and use the user and password in your backup application.
