Media Off line message

I've been using Premier Pro CC and Media encoder for several years Today suddenly I started getting a media off line message after exporting from PP to ME. The video is fine in PP but somehow it's showing up as off line in ME I've used this same video codec for years as well so I have no clue why the images and audio are not going to ME. I've tried reimporting the video into PP and also reimporting the video into the computer as well as starting a new PP project. It's driving me crazy.Thanks

Ted