BLAST Database error: No alias or index file found for protein database

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Hello,

I am trying to run psiblast with a swissprot database in fasta format with

dbname="/path/to/db/swissprot.fasta"
psiblast -comp_based_stats 1 -evalue 0.001 -num_iterations 3 -db $dbname -query /path/to/Q60175.fasta -out_ascii_pssm Q60175.profile

I always get

BLAST Database error: No alias or index file found for protein database [/path/to/db/swissprot.fasta] in search path [/home/main::]

I know this is a possible duplicate to this post but I tried both with swissprot.fasta and only swissprot as well as different folders and path versions and it's always the same error, so I am guessing the error is somewhere else. The swissprot.fasta file is NOT in another folder named swissprot.
Does someone know what the '::' at the end of the search path stand means?

Any help is appreciated.


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