Grammatical error in error message

Author: [email protected]

src/main/java/org/owasp/esapi/crypto/CipherTextSerializer.java

@@ -302,7 +302,7 @@ private CipherText convertToCipherText(byte[] cipherTextSerializedBytes)
 
             debug("convertToCipherText: kdfPrf = " + kdfPrf + ", kdfVers = " + kdfVers);
             if ( ! versionIsCompatible( kdfVers) ) {
-            	throw new EncryptionException("This version of ESAPI does is not compatible with the version of ESAPI that encrypted your data.",
+            	throw new EncryptionException("This version of ESAPI is not compatible with the version of ESAPI that encrypted your data.",
             			"KDF version " + kdfVers + " from serialized ciphertext not compatibile with current KDF version of " + 
             			KeyDerivationFunction.kdfVersion);
             }