Getting exception on server when using RSA via CSharp-easy-RSA-PEM

I have used https://github.com/jrnker/CSharp-easy-RSA-PEM for RSA implementation in my mvc project.

It's working fine in my local machine in IIS & also via visual studio but when I deploy my application on server, it gives me below exception.

"System.NullReferenceException: Object reference not set to an instance of an object.\r\n at CoreEntities.Classes.Utility.RSADecrypt(String input)\r\n at WebAPI.Attributes.ApiAuthorizeAttribute.Authorize(HttpActionContext actionContext)"

My code is :

public static string RSADecrypt(string input)
{
    try
    {
        string priv = File.ReadAllText(HostingEnvironment.MapPath("~/Certificates/consumer.pem"));
        RSACryptoServiceProvider privc = Crypto.DecodeRsaPrivateKey(priv);
        return Crypto.DecryptString(input, privc);
    }
    catch (Exception ex)
    {
        throw ex;
    }
}

I posted my issue on github also @ https://github.com/jrnker/CSharp-easy-RSA-PEM/issues/8

After debugging a lot, I figured out that system is not creating an object of RSACryptoServiceProvider

CspParameters parms = new CspParameters();
parms.Flags = CspProviderFlags.NoFlags;
parms.KeyContainerName = Guid.NewGuid().ToString().ToUpperInvariant();
parms.ProviderType = ((Environment.OSVersion.Version.Major > 5) || ((Environment.OSVersion.Version.Major == 5) && (Environment.OSVersion.Version.Minor >= 1))) ? 0x18 : 1;

// Exception is comping in below line.
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(parms);

RSAParameters rsAparams = new RSAParameters();

Exception:- System.Security.Cryptography.CryptographicException: The system cannot find the file specified.\r\n\r\n at CoreEntities.Classes.Utility.RSADecrypt(String input)\r\n at WebAPI.Attributes.ApiAuthorizeAttribute.Authorize(HttpActionContext actionContext) Can anyone please help...