This error means that the algorithm is unknown or mistyped; here "SSE_C" was used rather than "SSE-C":

java.io.IOException: Unknown Server Side Encryption algorithm SSE_C
    at org.apache.hadoop.fs.s3a.S3AEncryptionMethods.getMethod(S3AEncryptionMethods.java:67)
    at org.apache.hadoop.fs.s3a.S3AUtils.getSSEncryptionAlgorithm(S3AUtils.java:760)

Make sure to enter the correct algorithm name.