OpenVas database Missing on OMP server

I have installed Openvas 6 on Debian 7 and the following message appears in the Greenbone Security Assistant:

Warning: SecInfo Database Missing
SCAP and/or CERT database missing on OMP server.

I have synchronized with SCAP Feed & Cert Feed in the administration menu, but the message still appears.

In addition, I have run the command “openvas-certdata-sync” with the same warning

You need to copy the files from the tarball to “/usr/share/openvas/cert/” which includes the following files:
1. cert_db_init.sql:
2. dfn_cert_getbyname.xsl:
3. dfn_cert_update.xsl:

Then run the openvas-certdata-sync command again.