The "Integer-wert" error is getting "35@City Centre" which sounds like a line that would be in a HOF file, so I expect it to be an error there, or something that is processing information from it (a bus). I don't know which or why.
As for no [entrypoints], that suggests the map is for Omsi 1 not 2. It's possibly it needs to be opened and re-saved in the Editor before it will work. I've not delved into getting Omsi 1 maps to work in Omsi 2, so I can't really help you there.
As previously stated, those missing splines can only be acquired by downloading whichever map includes those files in a dumb place. Which map that is I have no idea.