Illustrator - After Effects - Updating assets

[TORM3NTO]

Hello everyone,

I am animating a diagram on After Effects using graphics created in Illustrator. In order to animate the arrows I had transformed the vector into shape and stupidly deleted the Ai file. Now that I need to change color, I'm not able to anymore. I tried importing just the layer of the new arrow into the pre-comp but for some reason it doesn't show up. There is weird text at the bottom-left of the frame that is impossible to even read. Thank you in advance!

[Anna Lander]

Show please a screenshot.

Did you delete an AI layer in composition, or an imported AI from Project panel, or an AI file from disc?

Is there anything in that AI layer except the arrow? 
Actually, when you've created the shape layer you don't more need an original AI layer.
The main thing: generally you can change the shape's color or gradient any moment using Fill module in Control panel or Fill part in Shape layer properties, and this works for any shapes.