If the drawing looks fine visually and you are under a tight deadline, you can choose when the popup appears.
Method 1: Locate and Copy the File (Best for Civil 3D Users) aeccland.shx
In the AutoCAD ecosystem, .shx files are vector-based files that define either text fonts or shapes used in complex linetypes. Specifically, aeccland.shx is part of the object library. If the drawing looks fine visually and you
If you have the file from a colleague or a backup, you must place it in a folder AutoCAD can see: aeccland.shx