program EPCS flash

Can you copy the text and paste it into the forum to see the complete error message... I don't see everything from this line...

Some basic questions:

Did you also add the pins to your toplevel, connected them to the right pins of your FPGA and connected them to your NiosII?

E.g.

Toplevel:

--epcs flash device

iFlashData0 : in std_logic;

oFlashDClk : out std_logic;

oFlashSce : out std_logic;

oFlashSdo : out std_logic;

NiosII instantiation:

-- the_epcs_controller

data0_to_the_epcs_controller => iFlashData0,

dclk_from_the_epcs_controller => oFlashDClk,

sce_from_the_epcs_controller => oFlashSce,

sdo_from_the_epcs_controller => oFlashSdo,

In Device and Pin options > Configuration and you have enabled "User configuration device" and you selected the EPCS.

There is standard no EPCS, but you soldered the EPCS4 to the board?