Error installing docker on linux mint

cannot install using Install Docker Engine on Debian | Docker Docs

error:

E: The repository 'https://download.docker.com/linux/debian wilma Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

how to fix this problem?

It’s for debian not for Linux Mint. If you want to install Docker CE on Linux Mint, it could be better to look around in the Linux Mint community. The supported operating systems are here:

https://docs.docker.com/engine/install/#supported-platforms

Linux Mint is not included.

Linux Mint seems to be based on Ubuntu, try that installer. But no guarantees.