This error occurs only if
- your parcel weighs more than the post office can have
- you have a volumetric weight of the parcel more than it can be at the post office
- your parcel dimensions are larger than the post office can have
In your case, in the log
https://onebox.leokor.com.ua/admin/logs/showall/ajax/?file=novaposhta-2021-01-04...it can be seen that there is a problem with the places for the order that you indicated
I can recommend creating a TTN manually if you need to send it to a parcel terminal through the tab
there you can specify the size, volume, etc.