AES Encryption - Invalid block size for Initialization Vector

greetings. I am trying to encrypt a string using the code below. The issue is I get this error and I have no clue (I'm just learning about encryption) what to do or even where to look. The SharedKey and the IV have been supplied as Hex values. The SharedKey is 64 bytes and the IV is 32 bytes.

System.Security.Cryptography.CryptographicException: 'Specified initialization vector (IV) does not match the block size for this algorithm.'

Code:

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    Public Function Encrypt(ByVal strValue As String) As String
        'Create instance of a Rijndael Managed object
        Dim aes As New RijndaelManaged
        'Set appropriate values of object
        aes.Padding = PaddingMode.PKCS7
        aes.KeySize = 256
        aes.Mode = CipherMode.CBC

        'Create streams to work with encryption process
        Dim msEncrypt As New MemoryStream()
        'SharedKey = "64 byte string"
        'IV = "32 byte string"
        Dim SharedKey As Byte() = Encoding.GetEncoding(1252).GetBytes(strSharedKey)
        Dim IV As Byte() = Encoding.GetEncoding(1252).GetBytes(strIV)
        Dim csEncrypt As New CryptoStream(msEncrypt, aes.CreateEncryptor(SharedKey, IV), CryptoStreamMode.Write)
        'Convert string value to byte array
        Dim toEncrypt As Byte() = Encoding.GetEncoding(1252).GetBytes(strValue)
        toEncrypt = Encoding.Convert(Encoding.GetEncoding(1252), Encoding.UTF8, toEncrypt)
        'Perform encryption

        csEncrypt.Write(toEncrypt, 0, toEncrypt.Length)
        csEncrypt.FlushFinalBlock()
        'Return Base64 string
        Return Convert.ToBase64String(msEncrypt.ToArray())

        'Dim u As System.Text.UnicodeEncoding = System.Text.Encoding.Unicode
        'Dim a As System.Text.ASCIIEncoding = System.Text.Encoding.ASCII
        'Return a.GetByteCount(SharedKey)  '64 bytes

    End Function

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Any help is mucho appreciated

Ensure that your IV is 16 bytes (from memory :p )

Kris