"The game failed to save. Error code: 526"

Every time I try to save my game I am greeted with the following error:
http://i.imgur.com/lYICnWg.jpg

This error persists regardless of what lot I am on, what family is set as active, or what mode I'm in (live, build, manage world, etc.), and the only way I've found so far to get rid of the error and be able to save again is to delete all of my saves and start over.

To try and find out what caused the bug, the last few things I was doing before encountering the bug are as follows, I was editing a family that were not active out of my gallery, and removed a couple of members of this family (lets call them family A), I had also edited a house that NPCs were living in via manage world. The family I had edited had existed in the world previousley, the reason I was editing them was because I had built a family using a different family as a base (call them family B). I had a copy of family A in the world, but upon creating family B noticed that family A had changed into the first few members of family B in the world, so I edited them to change them back. The last thing I did before running into the bug was go to a house where family B had lived but all died, but noticed since I edited family A back to how they previousley were, the gravestones of family B had changed names to that of family A, with the extra family members not existant in family now having their gravestones read as "---", since editing this household I have been unable to save, I have tried bulldozing the house to remove the broken gravestones but that did not help.

If I've left out any important information let me know.