If your firmware folder is named OpenSprinklerGen2.git, chances are you started from the pre-configured SD card image, which was from more than 3 years ago, and as was discussed in various other threads, is not compatible with the latest firmware anymore due to IPv6 support. What you need to do is to install the latest Raspbian, and follow instructions here:
https://openthings.freshdesk.com/solution/articles/5000631599-installing-and-updating-the-unified-firmware
to install firmware.
@bol: you said “This is the link”, without giving a link. If you can post the link, we will fix outdated information.
If you want to revert back to firmware 2.1.7, you can follow instructions here:
https://opensprinkler.com/forums/topic/opensprinkler-unified-firmware-compilation-error/#post-50250
But next time you update you will encounter the same problem. So it’s better to update your Raspbian now than to wait later.