Errors occurred during the build. Errors running builder 'DeploymentBuilder' on project 'xxxxx'. java.lang.NullPointerException

今天myeclipse10突然build总是报错，server view也报错打不开

build报错如下：

Errors occurred during the build.
　　Errors running builder 'DeploymentBuilder' on project 'product'.
　　java.lang.NullPointerException

　　Errors running builder 'DeploymentBuilder' on project 'tyjr'.
　　java.lang.NullPointerException

　　Errors running builder 'DeploymentBuilder' on project 'qydywxt'.
　　java.lang.NullPointerException

　　Errors running builder 'DeploymentBuilder' on project 'shcar'.
　　java.lang.NullPointerException

server view报错如下：

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

解决办法：找到工作空间下面的Workspaces\.metadata\.plugins\org.eclipse.core.runtime\.settings目录下面找到了名称为com.genuitec.eclipse.ast.deploy的prefs文件，然后删掉他！