Building workspace has encountered a problem.Error occured during the build.
打开MyEclipse时，有时候会出现：Building workspace has encountered a problem.Error occured during the build. ，下面这个方法可以解决这个问题。
关闭MyEclipse，找到工作空间下的如下目录：
"/.metadata/.plugins/org.eclipse.core.runtime/.settings/com.genuitec.eclipse.ast.deploy.core.prefs”
删除这个文件（Building workspace has encountered a problem.Error occured during the build.），重新打开MyEclipse后，就不会报错了。
（注：担心误删的话，可以先把这个文件备份一下。）