Android Question Problem using Java Object Library

I'm trying to create a USB interface to an FTDI FT245R device. I have the Java Object library working with some methods of the device but one has me stumped. The device API is

9.20 setBitMode
Definition:
public boolean setBitMode(byte mask, byte bitMode)

using result = FTdev.RunMethodJO("setBitMode", Array(0,0))

gives the error java.lang.RuntimeException: Method: setBitMode not matched.

Seems it should be straightforward passing two values but alas...

Thanks in advance for any help. Ken