Error saat upgrade manjaro

Total Download Size:    246.14 MiB
Total Installed Size:  1901.14 MiB
Net Upgrade Size:       219.43 MiB

:: Proceed with installation? [Y/n] y
:: Retrieving packages ...


(546/546) checking keys in keyring                                                      [##################################################] 100%
downloading required keys...
:: Import PGP key 4096R/, "Seblu <seblu@seblu.net>", created: 2011-11-11? [Y/n] y
:: Import PGP key 4096R/, "Antonio Rojas <arojas@us.es>", created: 2014-10-22? [Y/n] y
error: key "Antonio Rojas <arojas@us.es>" could not be imported
:: Import PGP key 2048R/, "Bernhard Landauer <oberon@manjaro.org>", created: 2015-07-12? [Y/n] y
error: key "Bernhard Landauer <oberon@manjaro.org>" could not be imported
:: Import PGP key 2048R/, "Christian Hesse (Arch Linux Package Signing) <arch@eworm.de>", created: 2011-08-12? [Y/n] y
error: key "Christian Hesse (Arch Linux Package Signing) <arch@eworm.de>" could not be imported
error: required key missing from keyring
error: failed to commit transaction (unexpected error)