# How can I avoid this camera tracking error? “Some data failed to reconstruct (see console for details)” [duplicate]

I'm currently following Sebastien Konig's Match Track Blend DVD and have encountered a problem where despite matching camera type, lens type and trying to solve for distortion, I'm getting the following console messages when I try to Solve Camera Motion:

bpy.ops.clip.solve_camera()
Some data failed to reconstruct (see console for details)


And I'm getting an average Solve Error of 0.9561, where I'm used to getting .4 and below. So what's going on?

The related files can be found here.

This may be related to another question I've asked on the site - Why can I not select camera trackers in the graph view of the Movie Clip Editor?
I figured that the issues were different enough that I should give them different questions.

Many thanks to everyone who built and everyone who visits this site. StackExchange/Answers style-sites are very useful to me and I appreciate any time spent trying to answer the questions people ask here. (Thus ends that digression!)

• What does it say in the console when this occurs? – gandalf3 Sep 13 '13 at 7:38
• I have been able to reproduce this, but I haven't found any consistent reasons for this happening.. The only thing that happens every time is problematic tracks will not display any average error. I can get rid of this by cleaning bad trackers and making sure there are a good number of good trackers, but I don't know what actually causes this. – gandalf3 Sep 30 '13 at 2:05