iTunes: library no show (unknown error -51)

I have used iTunes without even a hint of any problem since owning my mac. Recently brought an external hard drive and now host my 30+GB of music there, again, without any problems.
Today, very suddenly nothing shows up in my library when i open itunes and it shows an unknown error (-51).
Has anyone experienced this?
Can anyone help?
Desperate to have it all back.
Thanks in advance for your time.
Rich
 
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