Cannot create backup from MESDP 8.2

Cannot create backup from MESDP 8.2

Dear Expert

When I run BackUpData.bat, I get no backup file and the following shows at commant prompt:

java.lang.Exception: Unable to get the data from [ServiceReq_9] table
        at com.adventnet.servicedesk.tools.SDBackUp.dumpTableUsingLimit(SDBackUp.java:1222)
        at com.adventnet.servicedesk.tools.SDBackUp.dumpTableUsingLimit(SDBackUp.java:1241)
        at com.adventnet.servicedesk.tools.SDBackUp.dumpTableUsingCriteria(SDBackUp.java:918)
        at com.adventnet.servicedesk.tools.SDBackUp.dumpTable(SDBackUp.java:891)
        at com.adventnet.servicedesk.tools.SDBackUp.startBackup(SDBackUp.java:353)
        at com.adventnet.servicedesk.tools.SDBackUp.process(SDBackUp.java:95)
        at com.adventnet.servicedesk.tools.SDBackUp.main(SDBackUp.java:1955)

What should I do ?
Your help will be highly appreciated.

Pooya

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