It seems that the export of Family Historian use GEDCOM extension to create place entities.
Ancestris is not able to understand this type of entity.
If you have possibility to export again from Family Historian with a more compatible version, it will save you a lot of time.
If not : you have to create in each entity where you find a _PLAC tag the corresponding subtag to define correctly the place.
Typically, if you have an individual with :
0 INDI @...@
1 NAME ....
2 BIRT
3 _PLAC @P3@
You need to change it by :
0 INDI @...@
1 NAME ....
2 BIRT
3 PLAC Second Broughshane Presbyterian Church, 3 Raceview Road, Broughshane, County Antrim, Northern Ireland, United Kingdom
4 MAP
5 LATI N54.8924306
5 LONG W6.2111583
And do this for all places of your GEDCOM file.
I hope you will able to export again...
Zurga