Composer installation package times any version of your minimum-stability (stable)

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Today to install a bag endroid/qrcode, but anyway not installed.
Composer require the installation of the time has been reported

[InvalidArgumentException]
Could not find package Endroid/qrcode in any version for your minimum-stability (stable). Check the PAC
Kage spelling or your minimum-stability

Then the new composer init an empty project can be installed. Then start to analyze the Composer.json file for my existing project.

The last discovery was the use of a domestic composer mirror, plus a configuration

{
"Repositories": [
{
"Packagist": false
},
{
"Type": "Composer",
"url": "Http://packagist.phpcomposer.com"
}
]
}

Only the last paragraph has been deleted and no previous paragraph has been deleted. The previous paragraph of the "Packagist": false also deleted the good.