UnicodeDecodeError issue

[Ferrous Cranus]

Suddenly my webiste superhost.gr running my main python script presents 
me with this error:

Code:
UnicodeDecodeError('utf-8', b'\xb6\xe3\xed\xf9\xf3\xf4\xef 
\xfc\xed\xef\xec\xe1 \xf3\xf5\xf3\xf4\xde\xec\xe1\xf4\xef\xf2', 0, 1, 
'invalid start byte')


Does anyone know what this means?


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