尝试安装fm-labs/cakephp-backend插件时遇到错误。请帮帮我！
Using version ^1.4 for fm-labs/cakephp-backend
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1
- Installation request for fm-labs/cakephp-backend ^1.4 -> satisfiable by fm-labs/cakephp-backend[1.4.0].
- fm-labs/cakephp-backend 1.4.0 requires fm-labs/cakephp-bootstrap dev-master -> no matching package found.
Potential causes:
- A typo in the package name
- The package is not available in a stable-enough version according to your minimum-stability setting
see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details.
- It's a private package and you forgot to add a custom repository to find it
Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.
Installation failed, reverting ./composer.json to its original content.