MyEclipse server窗口出现Could not create the view: An unexpected exception was thrown

java.lang.NullPointerException 
at com.genuitec.eclipse.ast.deploy.core.Deployment.<init>(Unknown Source) 
at com.genuitec.eclipse.ast.deploy.core.ModuleDeployment.<init>(Unknown Source) 
at com.genuitec.eclipse.ast.deploy.core.WebDeployment.<init>(Unknown Source) 
at com.genuitec.eclipse.ast.deploy.core.Deployment.create(Unknown Source) 
at com.genuitec.eclipse.ast.deploy.core.DeploymentManager.loadFromPreferences(Unknown Source) 
at com.genuitec.eclipse.ast.deploy.core.DeploymentManager.init(Unknown Source) 
at com.genuitec.eclipse.ast.deploy.core.DeploymentManager.<init>(Unknown Source) 
at com.genuitec.eclipse.ast.deploy.core.DeploymentManager.getDefault(Unknown Source) 
at com.genuitec.eclipse.ast.deploy.core.ui.ServerTreeViewer$ServerTreeContentProvider.inputChanged(Unknown Source) 

出现原因：

应该是在tomcat或者weblogic等部署工具中直接删了工程，导致与myeclipse两边不一致。

解决方法： 

详细错误第一行： at com.genuitec.eclipse.ast.deploy.core.Deployment.<init>(Unknown Source) 

找到工作空间所在目录\.metadata\.plugins\org.eclipse.core.runtime\.settings目录下面找到了名称为com.genuitec.eclipse.ast.deploy.core.prefs文件，删除该文件，重启Eclipse。