Minimum allowed version 23

[RufflesRidge]

Your Eclipse plugins are out of date and are looking for 2015v23. This is admittedly an odd thing to have happen if you had this computer working before.

[5010Mentor]

We found the problem.

The FRC plugins updated mid-week and created a conflict between it and what was in c:\user\<id>\wpilib. Fixed the problem by renaming the directory and letting Eclipse recreate it.