Error code 28773 was returned by the CoreAudio driver

I don't know exactly what this means, but a quick google search suggests that you need to re-install or update your driver software for your (Digidesign?) interface.

You're going to have to be a bit more specific here, I don't have a handle on those error code numbers - they're a clue to developers rather than users, but it really does look like a driver issue, so its probably a matter of ensuring that you have the latest driver for your audio or MIDI inteface (usually both but it depends what you're using and trying to do) and its compatibility with the OS version that you have.

Glad you're up and running again, maybe your driver software had become corrupted, but as for your other problem - oh, dear....

All I can say is that its a problem some people are experiencing, so look through the threads here (there are plenty of long ones regarding this problem). It appears to be an OS/Apple hardware combination as far as I can tell, but it doesn't appear that anyone has provided a definitive solution - you may find something that helps if you spend some time looking. I bought a new Mac Mini Server with Lion and I'm on the latest Logic version and its the best experience I've ever had, so I guess I'm lucky (for once).

Sorry to bump this post but I also have the same problem (no avid or digidesign interface ) ! I was wondering if there was any other way of than formatting the whole computer (I have important files and no solution to backup everything...).

The only thing I noticed is that the problem came suddenly after I had a bunch of updates on my Komplete 8 softwares.

Go to Root/Library/Audio/MIDI Drivers

List what you have in there...

That's another problem : the system tells me that the MIDIServer can't be reached.

Yucky wrote:

That's another problem : the system tells me that the MIDIServer can't be reached.

What? Go to your system drive, open the the "Library" folder, open the "Audio" folder, open the "MIDI Drivers" folder, what do you have listed there, what are the names of the drivers?

Here's what I have :

file://localhost/Library/Audio/MIDI%20Drivers/DigidesignFireWireMIDI.plugin/

file://localhost/Library/Audio/MIDI%20Drivers/DigidesignMbox2MIDI.plugin/

file://localhost/Library/Audio/MIDI%20Drivers/DigiDioMidiDriver.plugin/

file://localhost/Library/Audio/MIDI%20Drivers/NIUSBMIDIDriver.plugin/

file://localhost/Library/Audio/MIDI%20Drivers/NIUSBTraktorKontrolS4MIDIDriver.pl ugin/

I suppose the Digidesign plugins came from the CoreAudio_Installer_v803_64550.dmg I installed a 2 days ago to try and solve my problem.

Yes, The Digidesign drivers are NOT Lion compatible as far as I know.

What I would do is create a folder on your desktop and Move all of those drivers out og the "MIDI Drivers" folder, you may or may not have to enter a password. Shut down your Mac, then restart...

Then see if Logic starts.. if so, quit Logic and add drivers back one at a time starting with NIUSBMIDIDriver.plugin, test Logic, if it works move on to the TraktorKontrol driver...

The Digidesign stuff is mostly if not all incompatible with Lion (as far as I know) I don't know if any of the Digidesign drivers have been updated to be L or ML compatibility.

If Logic still does not want to load it could be the MIDI drivers are still in the startup cache so the OSX caches may have to be purged. I'll leave that for someone else to explain.

Ok, so I tried everything you said : I still get the error code even with every plugin out of the MIDI Drivers folder and even when there is only one or the both NIUSB plugins.

Ok, start a new thread for this problem, we've hijacked another users thread and it's confusing to anyone reading exactly what error you have compared to the OP.