Unable to write to output file
The deployment project cannot be built because an output file cannot be opened for writing. The file (or the folder containing the file) may have its read-only attribute set, or it may be opened exclusively by another process.
Output files are placed in the directory specified by the Output file name property in the Property Pages dialog box for the deployment project.
To correct this error
Check to make sure that no project output files are marked as read-only, or wait until the file is no longer in use.