For this error, this post onMiniToolcollects several useful solutions for you.
Lets check it out!
Wanderstop Save File Location
Where are you at with the game Wanderstop?

Why is your Wanderstop save file lost?
If there is no what you need, then follow the solutions below to get them back.
Learn how to easily fix Wanderstop not launching or crashing at startup on PC in this comprehensive article.
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Also, updating your PC would be none the worse for the save files missing error.
modernize your equipment and then go to verify if your game saves appear.
Option 2.

To fix the missing issue, tryadding the program through firewall:
Step 1.
TypeWindows SecurityinWindows Searchand pressEnter.
Head toVirus & threat protectionfrom the left pane > scroll down to selectManage ransomware protectionunderRansomware protection.
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Dont forget to exclude the Wanderstop game from antivirus.
Finally, power cycle your box.
Now, lets launch the game and do some checks.

Option 3.
After that, reboot your PC and make it recognize your save.
Now, look to see if the game saves can be found in Windows.
Is there a way to transfer Steam saves to a new computer?
Or will it’s crucial that you start each game over again?
Lets get it straight.
To back up Wanderstop game saves,MiniTool ShadowMakercan do the trick.
MiniTool ShadowMaker TrialClick to Download100%Clean & Safe
Step 2.
Launch it and click onKeep Trialto enter its main interface.
Select theSOURCEmodule >Folders and Files.
Then you’ve got the option to choose R.E.P.O.
save files as the backup source and click onOKto continue.
Turn toDESTINATIONand select a storage path for the backup image.
Its recommended you use an external hard drive or USB flash drive.
Tap onBack Up Nowto start the task at once.
Hope you’ve got the option to get your save data back.