YAMS crash

---- Stack Trace ----
   System.IO.__Error.WinIOError(errorCode As Int32, maybeFullPath As String)
       YAMS-Updater.exe: N 10548295
   System.IO.File.InternalCopy(sourceFileName As String, destFileName As String, overwrite As Boolean)
       YAMS-Updater.exe: N 00863
   System.IO.FileInfo.CopyTo(destFileName As String, overwrite As Boolean)
       YAMS-Updater.exe: N 00015
   YAMS.Util.CopyAll(source As DirectoryInfo, target As DirectoryInfo)
       YAMS-Updater.exe: N 00617
   YAMS.Util.CopyAll(source As DirectoryInfo, target As DirectoryInfo)
       YAMS-Updater.exe: N 00942
   YAMS.Util.Copy(sourceDirectory As String, targetDirectory As String)
       YAMS-Updater.exe: N 00159
   YAMS_Updater.frmMain.btnChangePath_Click(sender As Object, e As EventArgs)
       YAMS-Updater.exe: N 00568
   System.Windows.Forms.Control.OnClick(e As EventArgs)
       YAMS-Updater.exe: N 00101
   System.Windows.Forms.Button.OnMouseUp(mevent As MouseEventArgs)
       YAMS-Updater.exe: N 00275
   System.Windows.Forms.Control.WmMouseUp(m As Message&, button As MouseButtons, clicks As Int32)
       YAMS-Updater.exe: N 00999
   System.Windows.Forms.Control.WndProc(m As Message&)
       YAMS-Updater.exe: N 12251309
   System.Windows.Forms.ButtonBase.WndProc(m As Message&)
       YAMS-Updater.exe: N 00474
   System.Windows.Forms.Button.WndProc(m As Message&)
       YAMS-Updater.exe: N 00036
   System.Windows.Forms.ControlNativeWindow.WndProc(m As Message&)
       YAMS-Updater.exe: N 00070
   System.Windows.Forms.NativeWindow.Callback(hWnd As IntPtr, msg As Int32, wparam As IntPtr, lparam As IntPtr)
       YAMS-Updater.exe: N 00181