We're having the same problem I'm using DNN 4.0.2/CE 5.2. I don't know if this information helps, but we use the starter kit and compile agains core DNN and noticed that VS2005 thows a build error in the DNN core file (DNN/Admin/Files/FileManager.asc.vb) on the reference to ZipEntry. Seems to line up with the errors on the file manager.
Lines: 708 - 728 on the GetZipFileExtractSize function, Bold represents where it is getting the following error on complile:
'ZipEntry' is ambigous in the namespace 'ICSharpCode.SharpZipLib.Zip'
and this one
'ZipInputStream' is ambigous in the namespace 'ICSharpCode.SharpZipLib.Zip'
Private Function GetZipFileExtractSize(ByVal strFileName As String) As Long
Dim objZipEntry As ZipEntry
Dim objZipInputStream As ZipInputStream
Try
objZipInputStream = New ZipInputStream(File.OpenRead(strFileName))
Catch ex As Exception
ShowErrorMessage(MaskString(ex.Message))
Return -1
End Try
objZipEntry = objZipInputStream.GetNextEntry
Dim iTemp As Long
While Not objZipEntry Is Nothing
iTemp = iTemp + objZipEntry.Size
objZipEntry = objZipInputStream.GetNextEntry
End While
objZipInputStream.Close()
Return iTemp
End Function
Again, you may already know this but thought it might help. I got this error when building right after I installed CE for DNN4. Anxiously awaiting a fix.