Can't export attempt divide by zero

Can't export attempt divide by zero
Hi, o can't export my track! When I tryes it shows: "Can't export attempt divide by zero"
I don't now what to do!

xpacks:
3dcrowds
advertbridges
basic city xpack
CK Pits and Barriers
Default
FE style kerbs
grandstands
Japan Collection
JPN_Collection (nobori_Other)
MauroPack
Old UK Advertising
sym bridge
symmons garage
Track Tires
Trackside Sigh
Trackside_Objects
trucks
Walls-Backbrounds

I TRIED TO DELETE A LOT OF THINGS AND NOTHING!
HELP!
 
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