How to Instal A USB-UART Device Driver

Dear Experts,
I have developed a custom UsbUart Driver for FTDI UsbUart Device. I
developed the driver using KMDF framework. If I use Two INF files One
for USB device and the other for COM port on USBUART device, Then the
installation succeeds.But I want to install this virtual comport
driver using a single Inf file. I don't have anything at USB end to
do. My device appears in Device Manager as Virtual Com Port in MSPorts
Tab. If I try to install the device using only one Inf file I am
getting Error code 39. I don't understnad what is the problem If I use
only one inf.
Can anybody suggest me how to install my driver using a single Inf
file.
Thanks in advance.

Regards,
~Vijji
.

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