Some rpm files were missing.
Most likely, you want to create these signed copies.

Missing files:
/mnt/koji/packages/smeserver-akmods/1.0/1.el8.sme/data/signed/44922a28/src/smeserver-akmods-1.0-1.el8.sme.src.rpm
/mnt/koji/packages/smeserver-collabora/0.1.6/10.el8.sme/data/signed/44922a28/src/smeserver-collabora-0.1.6-10.el8.sme.src.rpm
/mnt/koji/packages/smeserver-extrarepositories/0.1/48/data/signed/44922a28/src/smeserver-extrarepositories-0.1-48.src.rpm
/mnt/koji/packages/smeserver-xt_geoip/1.3.1/25.el8.sme/data/signed/44922a28/src/smeserver-xt_geoip-1.3.1-25.el8.sme.src.rpm
/mnt/koji/packages/xtables-addons-kmod/3.25/4.el8.sme/data/signed/44922a28/src/xtables-addons-kmod-3.25-4.el8.sme.src.rpm
/mnt/koji/packages/xtables-addons/3.25/2.el8.sme/data/signed/44922a28/src/xtables-addons-3.25-2.el8.sme.src.rpm