Have anyone experienced this error, from the Apple’s developer console?

The strange thing is that according to the next screen, everything has been perfect:

At last, my push notification does not work, and I wonder If the problem comes from this “error”.
EDIT :
It comes just after uploading the CertificateSigningRequest.certSigningRequestfile generated by the Keychain Access application.
I finally found the problem !
I has this error message on Google Chrome (v19.0.1084.56), and when I tried on Safari everything worked perfectly.
I didn’t try on other web browser.