I already posted an error log in this thread I'm sure you already seen it
View attachment 3618895
im sure you've already seen this error log I already posted this error log of 0.12 a few days ago
The cantnot pickle 'weakref' object error has been report and being fixed i believe. This is what posted about that bug:
"3) Save error: TypeError: cannot pickle 'weakref' object
I checked all my code and finally found the cause of that damn save error. The reason is in the inventory, specifically in the Drag and Drop function. I will fix it in version 0.98.0.
If you are now playing version 0.12.0, 0.11.0 or less istalkivayut with it, then return to the village and go back to the map. The save will work. And if possible, don't play with your personal inventory open on the map until you've updated to 0.98.0.
Sorry about that, but it's a development process. Due to the sheer amount of content, it's not always possible to avoid bugs"
so your report is being worked on i believe