Oozie Shell Action Error: Incompatible minimum and maximum heap sizes specified

I tried to create and run oozie workflow with shell action like this:

<action name="shell-test">
<shell xmlns="uri:oozie:shell-action:0.1">
<job-tracker>${jobTracker}</job-tracker>
<name-node>${nameNode}</name-node>
<exec>hdfs</exec>
<argument>dfs</argument>
<argument>-mkdir</argument>
<argument>/tmp/test</argument>
</shell>
<ok to="end"/>
<error to="kill"/>
</action>

But, always got the error:
"Stdoutput Error occurred during initialization of VM
Stdoutput Incompatible minimum and maximum heap sizes specified"

The same workflow on CDH4.6.0 is working.