I try to create a new ZIP using function CreateFile but; I recive this message:

 Generated temporary filename was not unique.

Type: Xceed.FileSystem.DiskFile

FullName: C:\Documents and Settings\MARTHAXP\ASPNET\LOCALS~1\Temp\b0bca9ce-998b-422a-9c86-5288ef2934f8.tmp

 Please if everyone say something help me.

Hi im also getting this error

 Generated temporary filename was not unique. Type: Xceed.FileSystem.DiskFile FullName: C:\Documents and Settings\dpickering\Local Settings\Temp\aa74e1bd-1304-46c1-afcc-f0f94259fa8f.tmp

im using the following function to zip multiple files:

 
    Private Function ZipFiles(ByVal zipFilename As String, ByVal sourceFilenames As String()) As Integer

        Dim zipArchive As ZipArchive = Nothing
        Dim errorCount As Integer = 0

        Try
            ' allocate the destination file and create an archive from it
            Dim zipFile As DiskFile = New DiskFile(zipFilename)
            Dim zipFolder As ZippedFolder
            zipArchive = New ZipArchive(zipFile)

            ' configure zip archive
            zipArchive.BeginUpdate(zipArchiveEvents, Nothing)
            ' moderate compression level
            zipArchive.DefaultCompressionLevel = Xceed.Compression.CompressionLevel.Normal
            zipArchive.DefaultCompressionMethod = Xceed.Compression.CompressionMethod.Deflated
            ' no encryption (though imo there should be tbh)
            zipArchive.DefaultEncryptionPassword = String.Empty
            ' multi-part zip files are confirmed as not required
            zipArchive.AllowSpanning = False

            ' process each file individually
            Dim sourceFilename As String = String.Empty
            Dim processedFileCount As Integer = 0

            ' iterate through specified filenames
            For Each sourceFilename In sourceFilenames

                Try
                    ' check file location (root special handling)
                    Dim sourceFile As DiskFile = New DiskFile(sourceFilename)
                    Dim rootName As String = System.IO.Path.GetPathRoot(sourceFilename)
                    Dim pathName As String = System.IO.Path.GetDirectoryName(sourceFilename)

                    ' strip off path root (i.e. 'c:\')
                    pathName = pathName.Substring(rootName.Length, pathName.Length - rootName.Length)

                    ' If pathName and rootName are the same, the destination is the root of the
                    ' zip file so use "\" instead of string.empty
                    If pathName = String.Empty Then
                        pathName = "\"
                    End If

                    ' copy source file to destination zip 'folder'
                    zipFolder = CType(zipArchive.GetFolder(pathName), ZippedFolder)
                    sourceFile.CopyTo(zipArchiveEvents, Nothing, zipFolder, True)
                Catch ex As Exception
                    errorCount = errorCount + 1
                    EmitBackupError(ex.Message, zipFilename)
                Finally
                    ' update status bar
                    Dim percentageComplete As Integer = CInt((processedFileCount / sourceFilenames.Length) * 100)
                    CType(MdiParent, fMain).sbMain.Panels("Progress").Visible = True
                    CType(MdiParent, fMain).sbMain.Panels("Progress").ProgressBarInfo.Value = percentageComplete

                    ' no need to pump win32 message queue here as zipArchiveEvents_ByteProgression does it for us
                    'Application.DoEvents()

                    ' increment file counter (for status bar update)
                    processedFileCount = processedFileCount + 1
                End Try
            Next

            'delete output if errors occur to eliminate user confusion
            If errorCount > 0 Then
                If File.Exists(zipFilename) Then File.Delete(zipFilename)
            End If
        Catch ex As Exception
            EmitBackupError(ex.Message, zipFilename)
        Finally
            If Not zipArchive Is Nothing Then
                zipArchive.EndUpdate(zipArchiveEvents, Nothing)
            End If

            CType(MdiParent, fMain).sbMain.Panels("Progress").Visible = False
        End Try

        Return errorCount

    End Function

Are you using the latest version (3.7)?  We had a bug before version 3.6 which is now corrected :

A check is now made to ensure that a temp file has a unique name before it is created. 

Hello, we have a similar error trying to create a zip file using Xceed Copy method ... I have check our DLL version and It is 4.1.9460.14460 v (Xceed.Zip.dll / Xceed.FileSystem.dll)

here is our stack error