Making mouse-detectable zones

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XE800

I save the zone data like this:

Function SaveZones()
fo=WriteFile("Zones.dat")
For z=1 To 181
WriteInt(fo,ZoneProperty(z,1))
WriteInt(fo,ZoneProperty(z,2))
WriteInt(fo,ZoneProperty(z,3))
WriteInt(fo,ZoneProperty(z,4))
Next
CloseFile(fo)
End Function

But when using THIS to load:

Function LoadZones()
fi=ReadFile("Zones.dat")
For z=1 To 181
ZoneProperty(z,1)=ReadInt(fi)
ZoneProperty(z,1)=ReadInt(fi)
ZoneProperty(z,1)=ReadInt(fi)
ZoneProperty(z,1)=ReadInt(fi)
Next
CloseFile(fi)
End Function

... a Blitz alert-box shows up with the msg " Expecting ')' "

Why is this? I can't see any missing ')' anywhere :/ When removing the LoadZones function from the code, I get no alert.