Not had that particular one before but had an error right after logging in while pruning my friends list to remove people I just don't see anymore and/or don't fully trust.
just logged in ok using the Frontier Elite Dangerous Launcher, so it's not universal.
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That doesn't look like the normal client, is that Steam or Mac?
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After logging in, do not click on Play to launch the game.
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Instead click on the Options menu and select "Validate game files" to make sure all the files are ok,
as one maybe corrupted.
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It looks like an AVG Update a couple of days ago quarentined a file out of the game directory....have put it pack and its now running so Im hoping its an antivirus problem rather than an actial virus. (file was Watchdog.exe...if anyone can shed some light it would be appreciated.)