CAW: Help needed! "Cannot load this save game. It may have been saved with …

Hello, I recently published a post on mod the sims in which I described a problem with a world. Now I have started a new world and noticed that the same problem is occurring again. I get the following error message after exporting and opening the world in the game after saving: "Cannot load this save game. It may have been saved with expansion pack data that is no longer present on this system." The error occurred very early on this time. I had only created the terrain heights and textures in CAW. I therefore suspect that the problem could be related to the textures. 

I used Martine's and Nilxis Hylewood's textures into my folder where the normal/preinstalled ones are and used some of the „cc“ textures in the new world.

So l deleted these textures in CAW Tool, leaving only the normal grass texture. The bug was still there though, so I suspect there were some leftovers. Unfortunately, I'm not very familiar with s3pe, so I wanted to ask you for help on how to recognize and eliminate corrupt files. In s3pe there were some UNKN entries and some of the _IMG entries were black in the preview, some of the _IMG even had an error message (if someone is interested, I can also post pictures or the .world file)

For your information: I created a test world with the base textures and did not get any error messages. But I really don't want to lose my two worlds, in which I have already invested so much time :(