An internal error occurred during: "Launching project name on MyEclipse Tomcat". Java.lang.NullPointerExcept

This problem occurs when you open and run a Tomcat deployment project with Myeclipse10, and the following online research finds that the solution is:

If the above error occurs, follow the 3 steps below:
1, first close the myeclipse work space.
2, and then delete the work space under the
"/.metadata/.plugins/org.eclipse.core.runtime/.settings/com.genuitec.eclipse.ast.deploy.core.prefs"
This file. Some information about the deployment project is stored in this file. There is no error in deleting the information on this deployed project.
3, restart the start MyEclipse can be resolved.

For csdn on a great god, Link: http://bbs.csdn.net/topics/390588732?page=1 hereby thank