RESOLVED
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Hi there.
I am learning Xwiki and I have problem while create a plugin.
I writing code with eclipse but i can not add packages “com.xpn.xwiki.XWikiContext,com.xpn.xwiki.api.Api,com.xpn.xwiki.plugin.XWikiDefaultPlugin,org.apache.commons.logging.Log” etc…
How this packages add?
Can you describe? 
I have also tried to create the plugins and the issues which you are facing right now, I have gone through the same and also had to face the ERROR CODE 0XC0000428 while accessing the plugins.
Hi. I recommend that you don’t learn to write plugins since it’s a deprecated technology… been deprecated for over 10 years now 
Instead check out components: https://www.xwiki.org/xwiki/bin/view/Documentation/DevGuide/Tutorials/WritingComponents/