I have recently started learning ArcGIS on my own for a GIS position within the company I work for and am using the ArcGIS Tutorial 1 book. All of my exercises and projects from the tutorial have worked fine, but as soon as I open up existing projects from our company database none of the existing layers will show. They all have a red exclamation mark and I can't figure out how to see whats causing the problem. Any advice on where to start?
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