This is the error message for EIEIO (pronounce E-I-E-I-O). This error code is used for a variety of "hopeless" error conditions. Most probably you will encounter it when a translator crashes while you were trying to use a file that it serves.

You can thus think of it as an equivalent of the "blue screen of the death" or "Oops"... except that it's just an error! It doesn't take your whole system away with it, only the particular operations that was going on.