1. According to the online processing mode, open the project .project file --- modify <name> projectName </ name>
2. My situation is not any duplicate items in the list of the eclipse, so use a method online that is also futile, but then I found eclipse workspace do not know why, replaced, so I put workspace (workspace) to come back, resolve:
2-1. Click the Options menu in the file
2-2. Were drop-down menu to "switch workspace" option
2-3. Choose their own work area before
