Required PostgreSQL pgcrypto extension is NOT INSTALLED on this database.
Pgcrypto extension is NOT INSTALLED
Pgcrypto extension is NOT INSTALLED is a Common error with pgcrypto but you have to not that this extension is installed per database,Common error is to install it on the default postgres user.
Therefore while installing DSPACE do the do following :
root@repository:/dspace/config# su postgres postgres@repository:/dspace/config$ psql dspace dspace=# CREATE EXTENSION pgcrypto;