YumBaseError: Public key for psa-proftpd

[JuanCar]

Hello
Plesk couldn't make last update and report this error on logs file:

Installing packages
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* addons: centos.mirror.xtratelecom.es
* atomic: mir01.syntis.net
* base: centos.mirror.xtratelecom.es
* extras: centos.mirror.xtratelecom.es
* updates: centos.mirror.xtratelecom.es

(1/2): psa-proftpd-xinetd-1.3.5-6.el5.art.x86_64.rpm | 13 kB 00:00

(2/2): psa-proftpd-1.3.5-6.el5.art.x86_64.rpm | 1.7 MB 00:00
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA1 signature: NOKEY, key ID 4520afa9

atomic/gpgkey | 1.3 kB 00:00
Fatal error during packages installation: Public key for psa-proftpd-xinetd-1.3.5-6.el5.art.x86_64.rpm is not installed
YumBaseError: Public key for psa-proftpd-xinetd-1.3.5-6.el5.art.x86_64.rpm is not installed

ERROR: Failed to run the Yum utility.
The Yum utility failed to install the required packages.
Attention! Your software might be inoperable.
Please, contact product technical support.

FTP server is working, but the update isn't.
Any idea?
Thanks

 

[IgorG]

Run

# yum upgrade atomic-release

before update.