使用composer遇到“Your requirements could not be”错误怎么办

使用composer遇到“Your requirements could not be”错误的解决办法：

Your requirements could not be resolved to an installable set of packages.

如果出现下面这种情况：

Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

需要安装一个composer资源插件，运行命令安装即可：

composer global require "fxp/composer-asset-plugin:^1.4.1"