InstallCDCustomization "Incorrect CD-ROM Detected"

[daimadoshi]

Hi,
i have create a Custom ubuntu cd with the guide https://help.ubuntu.com/community/InstallCDCustomization#head-7dcb221f59b638ccc230c960b84f7142cb529598 . But when i try to install i have this error: "Incorrect CD-ROM Detected".
Help me please.

Thx

[dino99]

burn the cd as slower as you can for better result

[daimadoshi]

Thx for reply but i used virtualbox for test the iso without burn it. i try to sign the cd but nothing.