Suggested fix (unconfirmed): Open the provided community guide links directly in your web browser instead of searching through the Steam client. If a specific guide remains hidden, the author likely deleted or set it to private.
The problem
there was an awesome guide that helped me a lot and now it's gone anyone knows what happened to it?
Suggested fix (unconfirmed): Open the game in windowed mode and click the maximize button, or use a program like Magpie with the Anime4K preset to upscale it.
Suggested fix (unconfirmed): Load an earlier autosave to bypass the corrupted manual save. If the error persists, check your PC system for conflicts with the game.
Evenicle uses the Documents folder to store save data, and this can fail if the Documents folder is synced with OneDrive. If you temporarily unsync your Documents folder from OneDrive, it should allow the game to run.
Suggested fix (unconfirmed): Find and complete the "Guilty and Beauty" sidequest chain, starting from the tent in the mountain west of Big Bux in the El Quixote region, to obtain the Tailor skill for Aster.