Nios V/c issue: no valid Nios V instance

Hi,

I have synthesised a Nios V/c (3.0.0)-based SoC on a DE0-Nano board, which was successfully configured using the quartus_pgm command via a Nios V-shell terminal in Quartus Prime Standard 24.1.

However, when the niosv-download command is executed after generating BSP and ELF files, the following message appears on the display: 

... There are no devices with valid Nios V instance(s)
ERROR: Failed to generate OpenOCD config file. ...

However, if the same Quartus project is compiled with the Nios V/c (3.0.0) core replaced by a multicycle Nios V/m (26.0.0) core, this error does not appear, and the program runs successfully.

Could you please provide any hints on how to fix this error for the Nios V/c IP ?

Regards,

Domingo.