getting an error while updating my map
 

keep getting an error when i update my map this is what it says:

'29439476' is not a valid value for 'value'. 'value' should be between 'minimum' and 'maximum'.
File: exp03_world_map.dds
at System.Windows.Forms.ProgressBar.set_Value(Int32 value)
at WindowsApplication7.Form1.dlw_ProgressChanged(DownloadWorker& sender)
at WindowsApplication7.DownloadWorker.DownloadFile()