[Dxbase] import error with DR1A callsign

[George Perkins - Ku3o]

Hello Folks,

I just finished the ARRL DX CW contest and am now trying to import
the ADIF file from my contest logger into DXBASE...

I am using non-dxb import of course...

I get 3 errors, all the same for the callsign DR1A on 3 different bands...

ERROR:  Prefix? DR1A 20060218 042154 7027.00 40m  CW 599 599  
ERROR:  Prefix? DR1A 20060218 135345 14020.00 20m  CW 599 599  
ERROR:  Prefix? DR1A 20060219 143233 21034.00 15m  CW 599 599  

Could someone please advise me on what I need to do to fix this and continue?
I'm sure it is simple, I've just never had this error before...

Thanks you all,
George - Ku3o