[xwiki-devs] Document copy

Hai When i try to use copy document it shows following error, how to solve this error Or how copy a document to another space [http-8088-Processor22] ERROR log.SimpleLog4JLogSystem - Left side ($request.sendbye mail) of '==' operation has null value. If a reference, it may not be in the con text. Operation not possible. Main.WebHome [line 39, column 28] Thanks Rajasekar