You are getting this error? Fortunately you can downgrade back to 1.0.6b. This is how you do it. Remember to back up your saved games! (Usually located in C:UsersYOURNAMEAppDataLocalColossal OrderCities_SkylinesSaves)
1. Back up your saved games somewhere.
2. Go to Steam, and right click Cities: Skylines.
3. Click Properties and then, Beta.
4. Select 1.0.6b and click close.
5. Click Play and press update. Then start the game and download your save.
This thread in the Paradox forum might also be helpful: http://forum.paradoxplaza.com/forum/showthread.php?847794-Patch-1.0.7b-has-arrived!