When generating a DDR3 controller, you may see an error similar to the following.
Error: s0: Cannot find sequencer/sequencer.elf
This error occurs when the DDR3 IP generation tries to invoke the Nios2 Command Shell and it fails.
In Windows, the most common reason is that Windows Subsystem for Linux (WSL) is not properly installed on the user's machine.
In Linux, either or both of the 32-bit libraries and build essentials are not installed correctly.
For Windows, make sure to install the WSL correctly. See the following solution for details
How to install the Windows* Subsystem for Linux* (WSL) on Windows* OS?
For Linux, make sure to install the required libraries and packages.
An Ubuntu example is shown below.
sudo dpkg --add-architecture i386
sudo apt update
sudo apt install build-essential