Hi Ajay-san
So far I tested with my FTD2XX driver and your FT4222.
Now I replace those FTD2XX to your driver.
Tested vi is below.
By using my driver, I checked all port are closed.
Then invoke above session and get result below.
The error happened at SPI_Master_Init.vi
Do you have any clue?
Regards,
Masao