我想使用apache oozie运行sqoop操作，但它总是给我错误：

Launcher ERROR, reason: Main class [org.apache.oozie.action.hadoop.SqoopMain], main() threw exception, null

我的workflow.xml是：

<workflow-app name="Datashop-Core-Sqoop" xmlns="uri:oozie:workflow:0.1">
<!--    <start to="inputAvailableCheckDecision"/>
         <decision name="inputAvailableCheckDecision">
                <switch>
                        <case to="sqoopAction">
                                ${sqoopInputRecordCount gt minRequiredRecordCount}
                        </case>
                        <default to="end"/>
                </switch>
        </decision> -->
    <start to="sqoopAction"/>
            <action name="sqoopAction">
                <sqoop xmlns="uri:oozie:sqoop-action:0.2">
                        <job-tracker>${jobTracker}</job-tracker>
                        <name-node>${nameNode}</name-node>
                        <configuration>
                                <property>
                                        <name>mapred.job.queue.name</name>
                                        <value>${queueName}</value>
                                </property>
                                <property>
                                        <name>oozie.libpath</name>
                                        <value>${oozieLibPath}</value>
                                </property>
                        </configuration>
                        <command>import --connect jdbc:mysql://${mysqlServer}/${mysqlServerDB} --username ${mysqlServerDBUID} --password ${mysqlServerDBPwd} --tabltable ${mysqlTable} -m 1 --target-dir ${targetDir}</command>
                </sqoop>
                <ok to="end"/>
                <error to="killJob"/>
        </action>
        <kill name="killJob">
                <message>"Killed job due to error: ${wf:errorMessage(wf:lastErrorNode())}"</message>
        </kill>
        <end name="end" />
</workflow-app>

始终引发sqoopmain类异常，该异常最终被视为错误：

@sqoopAction] ERROR is considered as FAILED for SLA

在一些堆栈问题中，我发现外部库需要包含在 <file> 所以我修改了workflow.xml并在下面添加了一行 <command> 标签：

<file>${oozieLibPath}/sqoop/mysql-connector-java-5.1.37-bin.jar#mysql-connector-java-5.1.37-bin.jar</file>

但同样的错误也产生了这个错误的原因。还有什么我需要配置的吗？