Errors

[MajorWoff]

Broken assets:

Custom Assets: 478820060.RetractBollard_Data: Duplicate prefab name
Custom Assets: 478820060.StoneBollard_Data: Duplicate prefab name
Custom Assets: 478820060.WoodBollard_Data: Duplicate prefab name
Custom Assets: 519519752.Elevated Train Stop_Data: NetInfo missing
Custom Assets: 478820060.CableStay32m_Data: Duplicate prefab name
Custom Assets: 478820060.Wood8mEPillar_Data: Duplicate prefab name
Custom Assets: 815682568.metro station-2205_Data: NetInfo missing [BrokenAssetException]

Details:
No details

[Oldhip]

Exactly the same as what I get

[76561198085803032]

Delete those assets...

[Mattstodon]

Originally posted by Laur Duffy:

Delete those assets...

How do I identify them?

[grapplehoeker]

Take the very first asset in the list and the reason for the failures will become obvious.
478820060 = this mod
http://steamcommunity.com/sharedfiles/filedetails/?id=478820060
This mod is now obsolete since the last game update.

It has been replaced by the new version. You must unsub the above mod first before subbing the new one.
http://steamcommunity.com/sharedfiles/filedetails/?id=812125426

If you were still using the outdated original version this long since the update, then there may well be other mods which you have not yet checked for game compatability yet. Many mods were updated or even replaced after the update, rendering the older versions obsolete.
Start managing your custom content.

[Saitek]

do not work in the Steam achievements. what to do ?

[grapplehoeker]

Originally posted by Saitek:

do not work in the Steam achievements. what to do ?

What to do? Well first off, don't hijack a thread with your random post. What does your question have to do with the OP's issue? Nothing at all.
As to your question, build cities with whatever mods you wish.
When you want achievements, turn your mods off and build other cities strictly in vanilla.