The error is indicating that you are missing a dblock file so the backup no longer has the hashed data blocks that existed in that file. This file cannot be recreated, you have to remove the dblock file from the database/dindex files which will also make the files that used that dblock unrecoverable. You need to use the command list-broken-files to show you what files used the missing dblock and are no longer recoverable, then run purge-broken-files to remove the dblock reference completely. Here is a post with some information about list-broken-files and purge-broken-files:
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