Received 409 (Conflict) for saving changes in workspace crx.default

When i creat a new jsp file and save the file  , i get the following error on CRXDE lite  :

Could not save changes. Received 409 (Conflict) for saving changes in workspace crx.default. This node already exists: /content/TrainingSite/contentpage.jsp

Can anybody please suggest the cause of the problem and the meaning of the code.

Thanks