cant backup OpManager

cant backup OpManager

Hi and please help!
Unable to backup OpMnager via default BackupDB.sh script

Output:

file:/opt/ManageEngine/OpManager/conf/OpManager/ui.properties

Please wait ! Trying to start database server .....
127.0.0.1:13306 - no response
127.0.0.1:13306 - accepting connections
IsFreshStart returned false and hence skipping Create tables
Successfully started database server.

Please wait ! Backup DB started  .....

 / 0 out of 3158 tables completed.

jdbc.BackupException: Error writing data to file.
        at jdbc.BackupDB.dumpDataToFile(BackupDB.java:244)
        at jdbc.AbstractBackupDB.backupDB(AbstractBackupDB.java:148)
        at jdbc.AbstractBackupDB.doBackup(AbstractBackupDB.java:667)
        at jdbc.BackUpImpl.backupDB(BackUpImpl.java:135)
        at jdbc.BackUpImpl.main(BackUpImpl.java:299)
Caused by: java.util.concurrent.ExecutionException: java.io.IOException: Cannot run program ""/opt/ManageEngine/OpManager/pgsql/bin/pg_dump"" (in directory "."): error=2, No such file or directory
        at java.util.concurrent.FutureTask.report(FutureTask.java:122)
        at java.util.concurrent.FutureTask.get(FutureTask.java:192)
        at jdbc.BackupDB.dumpDataToFile(BackupDB.java:241)
        ... 4 more
Caused by: java.io.IOException: Cannot run program ""/opt/ManageEngine/OpManager/pgsql/bin/pg_dump"" (in directory "."): error=2, No such file or directory
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
        at jdbc.BackupDBUtil$ExecuteCommand.executeCommand(BackupDBUtil.java:1080)
        at jdbc.BackupDBUtil.executeCommand(BackupDBUtil.java:1061)
        at jdbc.BackupDB$BackupDataThread.dumpDataUsingPgSqlDump(BackupDB.java:633)
        at jdbc.BackupDB$BackupDataThread.dumpData(BackupDB.java:422)
        at jdbc.BackupDB$BackupDataThread.call(BackupDB.java:383)
        at jdbc.BackupDB$BackupDataThread.call(BackupDB.java:354)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: error=2, No such file or directory
        at java.lang.UNIXProcess.forkAndExec(Native Method)
        at java.lang.UNIXProcess.<init>(UNIXProcess.java:247)
        at java.lang.ProcessImpl.start(ProcessImpl.java:134)
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
        ... 10 more

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