Cant change db (pg to mysql)

Cant change db (pg to mysql)

Hello,
We are having some problems to change the default db (pg) to myqsl.
we fallow the process in the ManageEngine documentation:
1. Stop server
2. Backup data
3 changeDB script
4. Restore data.

In the 4th step we get this error:
Unable to restore database : java.io.IOException: ./mysql//bin/mysqladmin: not found

We try:
1. create in bin directory a folder named "mysql"
2. create a link named "bin" to /usr/bin where mysqladmin is.
3 run the restore data script again

but the same problem.

grateful for any help

P.S.: Full Log is attached to this topic.
P.S. 2  sorry for my bad English

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