Create + update metafile error with Autovue

Hi, from Oracle Content Server when I try to open a document twice in autovue using view in Autoview, it hang.  The log file of Autovue, ..\AutoVue\bin\Logs, contains the following:

<log4j:event logger="com.cimmetry.jvueserver.management" timestamp="1307383466824" level="ERROR" thread="Metafile Creator">
<log4j:message><![CDATA[Error creating + uploading Metafile: ]]></log4j:message>
<log4j:throwable><![CDATA[com.cimmetry.core.DMSRemoteException: Error executing DMS request; nested exception is:
 java.lang.NullPointerException
 at com.cimmetry.dms.c.a(Unknown Source)
 at com.cimmetry.dms.c.a(Unknown Source)
 at com.cimmetry.dms.c.a(Unknown Source)
 at com.cimmetry.dms.c.a(Unknown Source)