Why is there the error "The requested protocol does not exist comm:0" ?

Hi all,
I want to read data from a USB serial port of the mobile phone ( Alcatel OT-806D ). The cable connects the phone and the computer. The system running in the PC is Windows XP. I launch a java j2se program which writes a number to the usb serial port. And in my midlet I run a j2me which will read on the usb port. The problem is that the output displayed in the item on my midlet is "The requested protocol does not exist comm:0". So why there is this error , and how to correct it ?
Thank you very much

only protocol required to be suppoted by a j2me mobile device is http://: some vendors to implement more protcols like socket:// but this depends on the vendor...

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