I'm trying to use iscan to scan some documents from my printer epson WF-3520. The problem is that if I try to run iscan program I get the following message:

Could not send command to scanner.
Check the scanner's status.

I already tried to open it from terminal: sudo iscan and I get the same result.

I am able to use the program Simple Scan to scan through my printer but only using the flatbed. If I try to use the document feeder the program freezes and the printer goes crazy forcing me to restart her. Also Simple Scan lacks many of the functionality of the iscan.