If the developer updated the game to a newer version of the Ren'Py engine between your two play sessions, the old save may be technically incompatible with the new engine's "pickling" (data saving) process [2, 4]. Steam Cloud Conflicts:

Are you trying to between devices right now, or are you developing a game and seeing this error on your build?

If you’ve ever transferred a Ren’Py save file from one computer to another—or tried to load a cloud save on a new device—you might have been greeted by this frustrating message:

or "Proceed" when the warning pops up. Ren'Py is generally good at reconstructing the state, though you might see minor glitches or missing images for one or two frames [1, 4]. Sync Persistent Data: If you are manually moving files, ensure you copy the persistent file located in the /game/saves/ folder or the %APPDATA%/RenPy/ directory alongside your files [2, 5]. Check Game Version:

Here’s a clear breakdown:

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