Cannot login to Minecraft

Cannot login to Minecraft

I tried to play Minecraft, I opened the launcher and put my username/e-mail and password.

When I pressed login, in the launcher appeared: Sorry, but we couldn`t connect to our servers. Please make sure that you are online and that Minecraft is not blocked. (IOException: Invalid Keystore Format)
I checked my firewall and Minecraft was not blocked, and I was connected to internet.