Cassandra error

KSCreate.java

List column_families = new ArrayList();
    	
        CfDef base_columns_cf_definition = new CfDef();
        
        base_columns_cf_definition.setKeyspace("Indexes");
        base_columns_cf_definition.setName("PrimaryIndexes");
        base_columns_cf_definition.setColumn_type("Standard");
        base_columns_cf_definition.setComparator_type("BytesType");
        base_columns_cf_definition.setKey_validation_class("BytesType");
        base_columns_cf_definition.setDefault_validation_class("BytesType");
        try {
			base_columns_cf_definition.setKey_alias("key".getBytes("UTF8"));
		} catch (UnsupportedEncodingException e1) {
			e1.printStackTrace();
		}
        base_columns_cf_definition.setCaching("all");

        column_families.add(base_columns_cf_definition);
        
        CfDef base_columns_cf_definition_index = new CfDef();
        base_columns_cf_definition_index.setKeyspace("Indexes");
        base_columns_cf_definition_index.setName("SecundaryIndexes");
        base_columns_cf_definition_index.setColumn_type("Standard");
        base_columns_cf_definition_index.setComparator_type("BytesType");
        base_columns_cf_definition_index.setKey_validation_class("BytesType");
        base_columns_cf_definition_index.setDefault_validation_class("BytesType");
        try {
			base_columns_cf_definition_index.setKey_alias("key".getBytes("UTF8"));
		} catch (UnsupportedEncodingException e1) {
			e1.printStackTrace();
		}
        base_columns_cf_definition_index.setCaching("all");
        
        column_families.add(base_columns_cf_definition_index);

        KsDef keyspace_definition = new KsDef();
        keyspace_definition.setName("Indexes");
        keyspace_definition.setCf_defs(column_families);
        keyspace_definition.setStrategy_class(props.getProperty("replication_strategy"));
        Map strategy_options = new HashMap();
        strategy_options.put("replication_factor", props.getProperty("replication_factor"));
        keyspace_definition.setStrategy_options(strategy_options);

        String[] conns = props.getProperty("cluster_ip_list").split(";");
		TSocket tsocket = new TSocket(conns[0], 9160);
		
		TFramedTransport transport = new TFramedTransport(tsocket);
		Cassandra.Client client = new Cassandra.Client(new TBinaryProtocol(transport));
		try {
			transport.open();
		} catch (TTransportException e) {
			e.printStackTrace();
		}
        try {
			client.system_add_keyspace(keyspace_definition);
		} catch (InvalidRequestException e) {
			e.printStackTrace();
		} catch (TException e) {
			e.printStackTrace();
		} catch (SchemaDisagreementException e) {
			e.printStackTrace();
		}

Stack trace

org.apache.cassandra.db.marshal.MarshalException: invalid UTF8 bytes 4ffc414b
        at org.apache.cassandra.db.marshal.UTF8Type.getString(UTF8Type.java:56)
        at org.apache.cassandra.cql3.ColumnIdentifier.<init>(ColumnIdentifier.java:47)
        at org.apache.cassandra.cql3.CFDefinition.getValueId(CFDefinition.java:140)
        at org.apache.cassandra.cql3.CFDefinition.<init>(CFDefinition.java:104)
        at org.apache.cassandra.config.CFMetaData.updateCfDef(CFMetaData.java:1303)
        at org.apache.cassandra.config.CFMetaData.valueAlias(CFMetaData.java:227)
        at org.apache.cassandra.config.CFMetaData.fromSchemaNoColumns(CFMetaData.java:1194)
        at org.apache.cassandra.config.CFMetaData.fromSchema(CFMetaData.java:1215)
        at org.apache.cassandra.config.KSMetaData.deserializeColumnFamilies(KSMetaData.java:291)
        at org.apache.cassandra.db.DefsTable.mergeColumnFamilies(DefsTable.java:359)
        at org.apache.cassandra.db.DefsTable.mergeSchema(DefsTable.java:271)
        at org.apache.cassandra.db.DefsTable.mergeRemoteSchema(DefsTable.java:249)
        at org.apache.cassandra.db.DefinitionsUpdateVerbHandler$1.runMayThrow(DefinitionsUpdateVerbHandler.java:48)
        at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)