Advanced Turbo Flasher says Invalid file name

Hi there,
Advanced Turbo Flasher gives me this error when I want to connect my phone and access my account. Is for the first time when I have this error and I don’t know hpw to manage it. Anyone can help me please to fix this ? What is causing this error ?
Thank you !

AdvancedBox Turbo Flasher
Invalid file name-%s.
Acceptar
