Why do I receive a "Code signing request failed because this file has been previously signed" error when signing my application?
The signing server saves the application version used during the last signing attempt, and requires that you use a unique version number for each signing attempt. To avoid this error, increment the version of your BlackBerry® Tablet OS application, and repeat the signing attempt.
BlackBerry® WebWorks™ SDK: Increment the value of the version" property in the <widget> element of the config.xml document; or specify a version using the -buildId command line argument for bbwp.exe.
Adobe® Flash Builder®: Increment the value of the versionNumber element within the project's <your_project_name>-app.xml file.