If you are connected via USB and receive this message, make sure the Wireless button on the back of the scanner is set to "OFF". By default, it is set to "ON" and you will receive this error message if trying to use the scanner via USB.
When scanning large-sized documents with the Long Document mode, scanning may be slower. Errors may also occur due to memory shortage and scanning may be disabled.
If you are using Windows Defender, follow these steps to exclude our CaptureOnTouch application from the Windows Defender software monitoring. Click "Turn on Windows Defender" from Windows Defender screen. Select "Virus & threat protection ", then open the "Virus & threat protection settings".