Issue
I suddenly encountered an error initializing Eclipse Kepler:
An internal error occurred during: "Repository registry initialization".
For input string: "(pilgrim's conflicted copy 2013-10-18).gen"
Solution
I found it!!!
Delete the directories inside:
.metadata/.plugins/org.eclipse.m2e.core/nexus/
And rebuild the maven project.
Note: this also applies to Eclipse Luna.
Answered By - John Fadria