Sorry to hear of your problems with this confusing error. I've searched around for you and found the following thread: After Effects warning: Error parsing properties list from memory
There are some potential solutions you can try in that thread. Please let us know if you found a solution there or if you still need help. We can also troubleshoot this issue with you over chat. Click here to get started with that.
Please return to the thread and let us know what's going on.