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in this process to changes I see that the can controller send a package in the Tx pin, but with an osciloscope it seem to be the error frame.
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What do you mean with error frame? On tx pin you must see the frame you write in the tx buffer, namely can_tx[] values coded according to CAN protocol.
An error frame would be possibly transmitted back from the can slave.
A few stupid questions:
Did you check with the oscilloscope if the baudrate you see on tx pin is correct?
Is PIC30F4013 CAN interface set to the same baudrate?
Did you try the rx as well? I mean transmit from the PIC30F and check if you receive anything on the DE2-nano
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