Using Magento 2.1.1, I would like to deploy a new adminhtml theme in cli. magento setup:static-content:deploy --theme Tc/theme.
[InvalidArgumentException] Tc/theme argument has invalid value, available themes are: Magento/blank, M agento/luma, Magento/backend, Venustheme/need

I follow this link to craete my theme Create a new storefront theme. After magento setup:upgrade, Tc/theme is added to database theme and parent_id is pointing to Magento/backend
Here are my codes


    "name": "magento/theme-adminhtml-backend",
    "description": "N/A",
    "require": {
        "php": "~5.5.0|~5.6.0|~7.0.0",
        "magento/framework": "100.0.*"
    "type": "magento2-theme",
    "version": "100.0.5",
    "license": [
    "autoload": {
        "files": [




<theme xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Config/etc/theme.xsd">
    <title>Magento 2 - backend</title>

What I want to do is to custom the phtml in adminhtml. Please help. Thanks.

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