I am trying to convert a whole lot of MP3 files and I keep getting error -50, on some of the tracks, but a significant percentage of them.

I have several thousand mp3 files I'd like to convert to AAC, to allow Itunes Match to have a better chance at actually getting a pozitive match.
Howver, after doing maybe 30 or so files I get an error - Error occured converting the file "<track Name>". An unknown error occurred (-50).
Any ideas anyone?
Itunes 10.6.3 (25) 64 Bit
OSX 10.8 (12A269)
Model Name:          iMac
  Model Identifier:          iMac12,2
  Processor Name:          Intel Core i5
  Processor Speed:          3.1 GHz
  Number of Processors:          1
  Total Number of Cores:          4
  L2 Cache (per Core):          256 KB
  L3 Cache:          6 MB
  Memory:          16 GB
  Boot ROM Version:          IM121.0047.B1F
  SMC Version (system):          1.72f5

Doing a quick Google search with this search criterea "iTunes An unknown error occurred (-50)" found several types of situations for that error code. I suggest you use the same search critera in a search and see if anything applies.
An Apple article found Here has to do with downloading music from iTunes. I assume that does not apply to you, but may be worth looking at.

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