Thank you for your feedback. In order to help you with your issue, please refer to the link below to attach system information and project files. https://kb.reallusion.com/Product/52943/What-should-I-do-if-the-Save-Project-Error-message-appears-when-saving-a-project-in-Cartoon-Animator-?_gl=1*hsp8q*_ga*ODY2OTUyOTQ3LjE2MjY3NzI0Mjg.*_ga_Q3FS71VPKC*MTYyNjg0NTQ5NC41LjEuMTYyNjg0NjkxMy4yNA.. Please feel free to let us know if you have any further questions. Allen Reallusion