当从插件调用代码时出现了问题:“org.eclipse.jface”

I'm new to all this and am following the HelloWorld tutorial. I got it run programmatically but when I try to do it using XML I get the message above in the log file when I try to run it. Basically every time I attempt to add a character to the strings.xml file in the res/layout directory I get an error window with the java.lang.NullPointerException. I can just click ok and continue editing the XML but when I view the error log I get the dump below and I can't figure out what to do. Have I not installed the plugin correctly. I installed 2.2I'm new to all this and am following the HelloW