[Eclipse/STS3] 이클립스 플러그인 설치 에러 (Eclipse Color Theme)

에러

Eclipse Color Theme 설치 중 에러

An error occurred while collecting items to be installed
session context was:(profile=DefaultProfile, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Result of processing steps.
OK
OK
OK
Public key not found for -9147676190077153272.
OK
Result of processing steps.
OK
OK
OK
Public key not found for -9147676190077153272.
OK

1. 설치 화면 Contact all update sites during install to find required software 체크 해제

2. 끝