world load error

I am win10 home edition. In my world of win10 edition, I have just entered a world and I want to copy my world. "Encrypt files for protection" is gray and has been checked. I check the "compressed file" option above and remove it. The “encrypt” tick below is gone immediately. Enter my world again, the world loading error. Now I can't even create a world. Seeds can‘t be used. What should I do? The folder of worlds‘file cannot be copied for transferring, too.