Sage 50 Decline error code 000051. This error message means that there are insufficient funds in your account. There are many sage 50 Errors like Decline Code 000057, Decline Code 000005, Fix Sage 50 Decline Error Code 000051, Sage 50 Error Code 000051, Sage 50 Decline Error Code 000051, etc. You need to call your issuing bank to get the issue fixed.