How do I resolve a Reporting Service Error

After upgrading DRM, how do I resolve a Reporting Service Error, ‘The path of the item ‘//Foldername/reportname is not valid.’ The full path must be less than 260 characters long; other restrictions apply. If the report server is in native mode, the path must start with slash? Open the Report Maintnenance window and look at the Report Technical Name. If it has a slash at the beginning, please remove it. Then click Save and run your report again. It should run without error now.