Missing AH Formatter commandline error in Oxygen transformation

[mmg-hinchey]

I am trying to use an Oxygen Transformation Scenario to convert DITA to PDF using the Antenna House processor on my hard drive. But, I keep getting this error:
Transformation failed. C:\DITA-OT-3x-WHR-PDF5-Beta\plugins\com.antennahouse.pdf5.ml\build_ahf.xml:122: Missing AH Formatter commandline executable (Windows) or shell (Linux) file at ahf.dir folder.

In build_ahf.xml, the code reads

<condition property="ahf.cmd" value="AHFCmd.exe">
        <and>
            <not>
                <isset property="ahf.cmd"/>
            </not>
            <available file="${ahf.dir}/AHFCmd.exe"/>
        </and>
    </condition>

In the Edit DITA Scenario box in Oxygen, I set up the ahf.dir parameter to point to C:\Program Files\Antenna House\AHFormatterV70

The executable file is located at: "C:\Program Files\Antenna House\AHFormatterV70\AHFCmd.exe"

What am I missing?

[mmg-hinchey]

I had not added Antenna House external FO Processor in the Oxygen XML Author preferences pages.

[ToshihikoMakita]

Here is sample transformation scenario setting in Oxygen.