Can't export FCPX

In the browser you’ll probably see a small camera icon on the clip. The message indicates the import isn’t complete, or the file is still linked to a camera card or to a camera card structure. From the File menu use Import>Reimport from Camera/Archive. Import the files in the location you want.

You'll have to reinsert the camera's SD card that has the original content on it. You probably ejected it before FCP was finished copying it over.

Or if the camera card is still in the reader, delete the media in FCP, then reimport from scratch, just be sure to wait for it to finish. Cmd-9 opens the Background Task window, so you can monitor the progress.

If there any media missing? Any missing file icons in the project? Look though the project carefully and see what titles and effects are missing. Are you using third party effects and titles and generators? Where are these stored?

What version of FCP is this?