/dev/mqueue POSIX Message Queue

I dont see /dev/mqueue on my QNX 6.1A system.
I have run mqueue process mananger also.

What could be the problem?
Can somebody provide a solution
Thanks in Advance,

I dont see /dev/mqueue on my QNX 6.1A system.
I have run mqueue resource mananger also.

What could be the problem?

Can anyone suggest a solution?

Thanks in advance,

It only appears when someone called mq_open().

But the call to mq_open() fails with error --Invalid Argument.