Signal Tap logic analyser issue

When you use SignalTap make sure that the correct device is selected in the "Device" box, just above the SOF Manager.

You may get this message if, for example, you have 2 devices in your JTAG chain (such as a MAX device and a Cyclone IV), and the device selected is MAX, instead of Cyclone IV, which you're trying to debug.

Make sure the device that is selected is Cyclone IV.

If this doesn't help, you can also click on "Scan Chain" and then select the correct device in the Device box.