PlayerSaves(Safe and Extended PlayerPrefs)

Hello, i have purchased this plugin but have a problem:

I have the following error:
“CryptographicException: Bad PKCS7 padding. Invalid length 0.
Mono.Security.Cryptography.SymmetricTransform.ThrowBadPaddingException (PaddingMode padding, Int32 length, Int32 position)”
On each file i use playersaves.
Autor of that plugin maybe its not working this week… but i have used google and found something:
"
Re: Rfc2898DeriveBytes for password hash not allowing for a longer Encryption Key"

This is the part where i have the problem, found on a forum:
http://forums.asp.net/post/5809465.aspx

What should i do?
Change this Rfc2898DeriveBytes?

I think the problem appears when recovering a playersaves with value 0