Dear Higuchi-san
This problem it occur because mismatch between name of folder scan FTP and Programe FTP Utility.
However, This problem will occur when customer have rename or delete the folder FTP.
Example:
Root Folder of Program FTP Utility browse to C:UsersAdministratorDesktopSCAN
Folder on the Desktop name is SCAN
After that if customer have rename is SCAN-1 on the Desktop this problem will occur when starting of windows OS