gmp: version @6.2.1_0 : Failed to verify signature for archive

[C-Compton]

I have attempted to search related tickets, and of those I found, none of the solutions have worked.

sudo port install gmp    
Password:
--->  Fetching archive for gmp
--->  Attempting to fetch gmp-6.2.1_0.darwin_19.x86_64.tbz2 from https://mse.uk.packages.macports.org/gmp
--->  Attempting to fetch gmp-6.2.1_0.darwin_19.x86_64.tbz2.rmd160 from https://mse.uk.packages.macports.org/gmp
Warning: Failed to verify signature for archive!
Error: Failed to archivefetch gmp: version @6.2.1_0
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_gmp/gmp/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port gmp failed

Permissions of /private/tmp

drwxrwxrwt   5 root  wheel   160 Jan 11 10:18 tmp