What does that Skype exclamation mark in yellow triangle mean?

SOLVED: Skype virus sending messages automatically

Why does Skype keeps opening on its own? How do I stop it?

skype won't ring incoming call

SOLVED: Skype won’t ring on incoming calls

xampp port 80 443 in use by skype

Sure Fix: XAMPP Port 80, 443 are in use on Skype

skype messages wrong order

Fix: Skype messages appear in the wrong order