Try this:-
What should I do if I'm getting a Epson Scan Cannot Be Started message?
This message occurs when the incorrect settings are selected in EpsonScan and the MFP Manager setup is not complete. You can resolve this message by doing the following:
1.Launch Epson Scan. (Start > All Programs > Epson Scan > Epson Scan Settings)
2.Be sure EPSON "CX9300F/CX9400F..." is selected in the Select Scanner box.
3.Make sure that Connection: Local is selected.
4.Verify Scanner Status: "Scanner is ready."
5.Click OK.
6.Double-click the MFP Manager icon in the Windows taskbar.
7.Select your all-in-one in the MFP Server List and click Connect.
8.Attempt scanning.
When you are done, select your all-in-one in the MFP Server List and click Disconnect.