Why am I seeing this in Adobe Premier Pro?

There is a possibility that you deleted or moved the file you were working with before letting the Premiere Pro project close for the last time, that means you have your clip offline as Ann says. Make sure the file is in the exact same directory you imported it from, or as Peru Bob says, close Premiere Pro and plug in the external drive you've been working with so your clip will automatically reconnect.

Is your media on an external drive that is not connected?

Your clip is offline:

Relinking offline media in Premiere Pro

You need to ask program questions in the forum for the program you are using
To ask in the forum for your program please start at https://community.adobe.com/
Moving from Using the Community (which is about the forums) to the correct forum