Leathers and bone are missing from races.gd > var tasklist so there is no "currenttask.code" for it to use.
Leathers are also missing from upgradedata.gd > var upgradelist so you can not add leather to home like other materials
Viewing post in No leather?
Bone, Ancient bone, and all the leathers can not be gathered at home. They must be gathered in towns and dungeons, bought in the shops, or found as loot in dungeons. There never has been an upgrade to gather leather or bones at the mansion. Some people have suggested that a Hunting upgrade should allow gathering basic leather and bones as well as meat.
The edit I mentioned above does fix the issue. You can also copy /src/character/ch_leveling.gd from 6.1a into 6.1b. That also fixes the issue, but I don't know if other changes were made to ch_leveling from 6.1a to 6.1b so other issues might arise.