Workaround: Modify the Project workspace.
Modify the workspace, before opening myeclipse know how to change! Now only the configuration file is found!
Steps:
MyEclipse 5.1.1 GA-----"Eclipse-----" configuration------". Settings----" Org.eclipse.ui.ide.prefs file
#Tue Jul 09:10:40 CST 2009
recent_workspaces_protocol=2
Max_recent_workspaces=5
Show_workspace_selection_dialog=false
Eclipse.preferences.version=1
Recent_workspaces=d\:\\caodf,c\:\\documents and Settings\\administrator\\workspace
Delete your previous work path! Save! Shut down! Just restart the MyEclipse!
You can also change the show_workspace_selection_dialog=false false to true to turn off eclipse and go in again to allow you to select the working range.
Solve
Eclipse MyEclipse modifies the work interval of an error have occurred. See error log for more details. java.lang.NullPointerException Problem Solving