Padding is invalid and cannot be removed exception while decrypting

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Hi,
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I am encrypting and decrypting a file using AES algorithm(128bit). But while decrypting i am getting the below error:
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<strong style="margin:0px; padding:0px; border:0px; font-size:14px; font:inherit; vertical-align:baseline System.Security.Cryptography.CryptographicException: Padding is invalid and cannot be removed. <br/>
<strong style="margin:0px; padding:0px; border:0px; font-size:14px; font:inherit; vertical-align:baseline at System.Security.Cryptography.CapiSymmetricAlgorithm.DepadBlock(Byte[] block, Int32 offset, Int32 count) <br/>
<strong style="margin:0px; padding:0px; border:0px; font-size:14px; font:inherit; vertical-align:baseline at System.Security.Cryptography.CapiSymmetricAlgorithm.TransformFinalBlock(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) <br/>
<strong style="margin:0px; padding:0px; border:0px; font-size:14px; font:inherit; vertical-align:baseline at System.Security.Cryptography.CryptoStream.FlushFinalBlock() <br/>
<strong style="margin:0px; padding:0px; border:0px; font-size:14px; font:inherit; vertical-align:baseline at System.Security.Cryptography.CryptoStream.Dispose(Boolean disposing) <br/>
<strong style="margin:0px; padding:0px; border:0px; font-size:14px; font:inherit; vertical-align:baseline at System.IO.Stream.Close() <br/>
<strong style="margin:0px; padding:0px; border:0px; font-size:14px; font:inherit; vertical-align:baseline at System.IO.Stream.Dispose()
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The padding i am using is PKCS7. The error is intermittent, so i am not able to find out why this is happening. I have gone through other forums related to this issue but couldnt find anything helpful for this case.
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Any help on this would be helpful.

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