While in-game, I have an error message with a sad poro picture.

This can happen for multiple reasons:

• Riot servers are having an issue. If so please contact me if the issue does not fix by itself by 24h.
• The Porofessor servers are down. In that case, please wait for a few hours and try again
• You are playing on a Garena server. Garena servers are not supported and probably never will :( Sorry.
• You are playing in an unsupported game mode. (Practice mode / Coop vs AI)
• You are playing on PBE. PBE server is not supported and probably never will :( Sorry.