Removing obsolete files from server... Could not clean server of obsolete files: null java.lang.NullPointerException

Removing obsolete files from server… Could not clean server of obsolete files: null java.lang.NullPointerException

http://stackoverflow.com/questions/23288991/tomcat-v7-0-stopped-to-run-my-project-at-localhost

double click on server look for server path delete a folder called tmp0 in C:\src\trunk\.metadata\.plugins\org.eclipse.wst.server.core