How to reproduce the issue  :

In ContextCapture Update 20.1  a known bug is affecting the automatic generation of water surface constraints. This bug will result in a failure during the Geometry constraints detection tasks.

Workaround:

In ContextCapture Update 20.1 , the workaround consists in : 

• Creating a new folder in the contextcapture installation in \data\AI\GeometryConstraints\
• Move the files metadata and water_detector.pb ,orginially located in \data\AI\GeometryConstraints\ ,in this new folder
• Rename the new folder with the name "water_detector.pb"
• Resubmit any failing productions. 

This will be fixed in the next release of ContextCapture.