Problem in decryption of file

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hello,
I have been using certificates for encryption and decryption using c# dot
net2.0.I have implemented in windows application .It works fine.The same
code used for implementaion in compactframework for Mobile 5.0,the
encryption parts alone work fine but decryption fails with error code
"Unknown Error '80007001".

I also verified encrypted data by decrypting it by windows application.It
decrypt to orginal data.

CspParameters cp = new CspParameters();
cp.KeyContainerName = container;
cp.ProviderType = this.providerType;
cp.ProviderName = this.providerName;
cp.KeyNumber = keyspec;
RSACryptoServiceProvider oRSA = new RSACryptoServiceProvider(cp);
clearkey = oRSA.Decrypt(encdata, false); !!Here i get the exception

Pls say me way how cany sort out the problem and find solution
.

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