dump file cannot be restore

so here is how i gona backup my file using dump command

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# dump -f [databackup name] [path or file name]

//example

# dump -f databackup /root/assignment1
# ls -l

// files show as 
# root root databackup

//but when try to restore using restore command
restore -if databackup

//i is enter interactive mode
//so i press
# restore > ls
# restore > add
# restore > ls
# restore > extract

//then it say what somekind of volume error. how? 


or any idea to restore the dump file?
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