Error: Messages for api FDNS Generators are "converted" (000488)

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It sounds like your file may have been converted for use in dynamic simulation calculations, switching studies, and the three sequence equivalencing. This is generally done through the [Power Flow]->[Convert Loads and Generators...] function. The best option is to find a version of the file before it was converted. If that isn't an option, and you're looking to perform typical power flows, I'd suggest saving your case from PSSE30 as a .RAW file, then opening that in PSSE33. You may even have some luck saving it as a .RAW file in 33, and then opening that same raw file. Good luck.

To avoid this problem (yes, it happen to me in the past) I suggest to add "cnv" as a suffix to the original case: savnw.sav - unconverted base case;

savnw_cnv.sav - converted base case, with generators converted to norton equivalent and (optional) load converted to zip model.