"Invalid method parameter: Set does not exist in database."
The reason is, if the set was saved with a set name that has spaces after it, it cannot be deleted via the GUI. To remove a set go to Jobs -> Manage Sets and select the set name that you want to delete and click Edit.
Without making any changes click on the Save Button.
Copy and note down the set name. (with spaces) Click Cancel to close the window.
Open Command Prompt as administrator. Change the working directory. (This is where NetVault Backup is installed)
cd "C:\Program Files (x86)\Dell\NetVault Backup\util"
Run below command to delete the set name from the database.
nvsetdelete -setname "<setname>" -type <settype>
BS (Backup selections) BO (Backup selection options) S (Schedule) BT (Backup Target options) AB (Advanced Backup Options RS (Restore selections) AR (Advanced Restore Options) nvsetdelete -setname "FILE-FULL " -type BS