Command is missing required clause. (1221)

Why am I getting this error here ?

UPDATE gaf!gafiles
SET gafiles.filesize = aNewData[i,2],
gafiles.filedate = aNewData[i,3],
gafiles.filetime = aNewData[i,4],
gafiles.fileattributes = aNewData[i,5]
WHERE ALLTRIM(gafiles.volume) = VolumeName AND ;
ALLTRIM(gafiles.filepath) = SearchPath AND ;
ALLTRIM(gafiles.filename) = aNewData[i,1]