Asterisk dynamic span error

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Hi Everybody,
I’m trying to connect an asterisk box to a provider
using Redfone Fonebridge dual E1.
Installation seems to run correctly only i can’t get the D Channel up and i
have the following error displayed.

DYN/ SPAN ethmf Expected seq no 0 , but received
3456 instead .
This error keep scrolling until i disconnect the ethernet cable connected
to the FoneBridge.

Any Help please.