我正在寻找如何修复以下错误消息，当我将数据表sqooping到oracle时，我会继续这样做。我能够在今天早上开始另一张桌子，但之后的每一次尝试都失败了。以下是日志文件中的错误：
Caused by GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)]
我不知道为什么我一直收到此错误消息，因为没有Kerberos票证我无法登录到Putty以便运行脚本来sqoop表格因此我很困惑a）为什么我得到这个错误b）我可以做些什么来解决它。
如果有人可以告诉我哪里出错了，我将不胜感激。
提前致谢。
日志文件中的部分错误消息：
17/01/05 15:08:52 INFO sqoop.Sqoop: Running Sqoop version: 1.4.6-cdh5.7.1
17/01/05 15:08:52 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead.
17/01/05 15:08:52 INFO oracle.OraOopManagerFactory: Data Connector for Oracle and Hadoop is disabled.
17/01/05 15:08:52 INFO manager.SqlManager: Using default fetchSize of 1000
17/01/05 15:08:52 INFO tool.CodeGenTool: Beginning code generation
17/01/05 15:08:53 INFO manager.OracleManager: Time zone has been set to GMT
17/01/05 15:08:53 INFO manager.SqlManager: Executing SQL statement: SELECT * FROM TABLE_NAME where SNAPSHOT_DATE_TIME >= '01-APR-16' and (1 = 0)
17/01/05 15:08:53 INFO manager.SqlManager: Executing SQL statement: SELECT * FROM TABLE_NAME where SNAPSHOT_DATE_TIME >= '01-APR-16' and (1 = 0)
17/01/05 15:08:53 INFO orm.CompilationManager: HADOOP_MAPRED_HOME is /opt/cloudera/parcels/CDH/lib/hadoop-mapreduce
Note: /tmp/sqoop-username/compile/ba4df230b0d18377522bbfe053ed3661/QueryResult.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
17/01/05 15:08:55 INFO orm.CompilationManager: Writing jar file: /tmp/sqoop-username/compile/ba4df230b0d18377522bbfe053ed3661/QueryResult.jar
17/01/05 15:08:55 INFO mapreduce.ImportJobBase: Beginning query import.
17/01/05 15:08:55 INFO Configuration.deprecation: mapred.jar is deprecated. Instead, use mapreduce.job.jar
17/01/05 15:08:55 INFO Configuration.deprecation: mapred.map.tasks is deprecated. Instead, use mapreduce.job.maps
17/01/05 15:08:56 WARN security.UserGroupInformation: PriviledgedActionException as:username (auth:KERBEROS) cause:javax.security.sasl.SaslException: GSS initiate failed [Caused by GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)]
17/01/05 15:08:56 WARN ipc.Client: Exception encountered while connecting to the server : javax.security.sasl.SaslException: GSS initiate failed [Caused by GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)]
....