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USBConfigureInterface error 2 -50



My OS9 driver works fine when used with OS9.1-OS9.2.2.  But when I use it in
Classic mode on OS10.1, I get an error that does not allow the driver to
configure the device correctly.  When the driver calls USBConfigureInterface
to complete the process of selecting an alternate interface, I see this
error in the log:

>>USBConfigureInterface error 2 -50<<

My completion routine detects error -50.

MacErrors.h says this is a paramErr.  But since the driver operates fine
with OS9 running "native" I am suspicious of OS 10.1.

Any advice?
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