Error e9027: The coordinate sytem in file is not valid - PIX4Dmapper

Error description: e9027 The coordinate system in the file is not valid. The output coordinate system must be a projection or arbitrary coordinate system. This article highlights a few of the most common solutions to aid the invalid coordinate system issue.

Make sure the project file is in a projected or arbitrary coordinate system

Projected coordinate system. For more information, Projected coordinate system.
Arbitrary coordinate system.

Check that the file has the correct prj syntax

Check the prj file structure in the following article How to obtain or create a .prj coordinate system syntax file.
Download the prj file from the database: https://epsg.io/.

Note: In any other case of a technical problem, please contact Support.