about 1 year ago - SLG-Dennis - Direct link
Please note this info for the support state on Eco:

Support Status of Eco on different Operating Systems
Windows 10+ (64 Bit): Supported.
Windows 10+ (32 Bit): Supported until Update 9.6 - No longer supported or provided for later Updates.
Linux: Unsupported. Development builds available and provided as-is without warranty. We recommend to use Proton. (Dedicated Server: Supported.)
Mac without M1: Unsupported. Development builds available and provided as-is without warranty.
Mac with M1: Unsupported. Development builds not working at all.

Steam Deck: Unsupported. Compatibility: Playable, no adjustments made. Windows: Works. Linux: Development build available and provided as-is without warranty.

SP has been confirmed working on Windows only. If this is Windows, the exact error message would be helpful, but there should be a log. Could also try starting the server executable directly and see the console message.