Why? I can't add comment to my thread.

[RedTropicalPeachyFish]

Hello.
I can't add comment to my thread.
Why?
Is reply count got to Maximum?
The answer exists in FAQ maybe, but I couldn't find it.
So, would you please help me?
What can I do to resolve this?

 

[RedTropicalPeachyFish]

I could add a comment to my thread now.
But... why??
Never mind. Thank you.