Check out your Paragraph pane: the character width is 0%... as in, "no width". The point size is also really big. Make the point size something reasonable like 70, change the character width to 100, and tweak from there.
> I'm using after effects CS6 version 18.104.22.1688
First, choose Help > Updates and install the updates. You are running several bug-fix updates behind:
Regarding your text issue:
You font size is 376 pixels, and your text layer's bounding box is tiny. Make your font smaller and you text box bigger, so that the characters can actually fit; then, they'll show in the composition frame.
This did the trick! Thank you so much!
Thank you for your help!