Be sure that you are using the latest version of YAFC
Try to remove outdated and disabled mods from your mod folder. If that helps, you may still make a report but you need to attach the whole contents of your mod folder, ioncluding all outdated and disabled mods.
Please note that YAFC is my personal project and I can't promise any support!
Specify the YAFC version and Factorio version
While YAFC should work with mods down to Factorio 0.17 (and maybe even earlier), I actively support only latest stable and latest experimental versions.
Attach a new game save file so I can sync mods to yours.
YAFC v0.5.8
Factorio 1.1.Experimental (1.1.91)
Pyanodon 3.zip
Loading Error with Pyanodon Mod suit as shown in screenshot, other modpacks like Krastorio or Seablock are loading fine