Custom_Field cards issues

since upgrading to latest version of HA I am no longer able to use the standard HA 'conditional' card as a custom_field card. I now get an error to say the card doesn't exist. I now get an error where this use to work perfectly before; <img width="1336" height="622" alt="Image" src="https://github.com/user-attachments/assets/bb05513a-d2f3-40d3-8c90-3a7bf326b495" /> <img width="415" height="63" alt="Image" src="https://github.com/user-attachments/assets/1fc52c49-c244-4306-9bba-f591b7412640" />