If the error returns immediately, you either did not run as Administrator, or your physical waste ink pad is saturated to the point of leaking. Turn off the printer and physically clean the pad.
The (often called a "Resetter") is a specialized utility used to fix "Service Required" errors on the Epson EcoTank ET-2720 when the waste ink pad counter reaches its limit. While many sites offer "free" downloads, these often trigger antivirus warnings because they are unofficial, modified versions of service center tools. Essential Guide to Resetting the ET-2720 Epson Adjustment Program Et 2720 Free Download