Refresh Update Site

Eclipse caches bundles in P2 Repository, By some reason, these caches can be broken. With this state, You can't install plugins properly. I can't sure, however, there are several possible scenarios that can cause this situation:

• Github mirror sync problem.
• Install plugins when releasing newer version in same time.
• Temporary network error.

Clearing cache

In most case just re-starting eclipse cause cleaning cache. What if your problem is going on, Try to clean cache manually:

1. Open Preference page.
2. Choose Install/Update > Available Software Sites from navigator which is located in left.
3. Choose Jeeeyul's Eclipse Update Site, Check it's url is http://eclipse.jeeeyul.net/update/.
4. Press Reload button.
5. Re-try to install plugins.