虽然构建Dockerfile有错误
解析HTTP 404响应正文时出错：无效字符'<'正在查找值的开头：
我的Dockerfile代码
FROM cloud.docker.com/repository/registry1.docker.io/sundardockers/testrepo1
昨天这对我来说很好。今天我收到了错误
error parsing HTTP 404 response body: invalid character '<' looking for beginning of value: "<!doctype html>\n<html lang=\"en\">\n\n<head>\n <meta charset=\"utf-8\">\n <title>404 : Docker</title>\n <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\n <style>\n * {\n line-height: 1.2;\n margin: 0;\n }\n\n html {\n color: #71859d;\n display: table;\n height: 100%;\n text-align: center;\n width: 100%;\n }\n\n body {\n background: #fff;\n display: table-cell;\n font-family: \"HelveticaNeue-Light\", \"Helvetica Neue Light\", \"Helvetica Neue\", Helvetica, Arial, \"Lucida Grande\", sans-serif;\n font-weight: 300;\n margin: 2em auto;\n vertical-align: middle;\n }\n\n a {\n color: #22b8eb;\n text-decoration: none;\n }\n\n\n @media only screen and (max-width: 280px) {\n body,\n p {\n width: 95%;\n }\n }\n\n #message {\n font-size: 21px;\n text-align: center;\n animation: fadein 2s;\n -moz-animation: fadein 2s;\n /* Firefox */\n -webkit-animation: fadein 2s;\n /* Safari and Chrome */\n -o-animation: fadein 2s;\n /* Opera */\n }\n\n @keyframes fadein {\n from {\n opacity: 0;\n }\n to {\n opacity: 1;\n }\n }\n\n @-moz-keyframes fadein {\n /* Firefox */\n from {\n opacity: 0;\n }\n to {\n opacity: 1;\n }\n }\n\n @-webkit-keyframes fadein {\n /* Safari and Chrome */\n from {\n opacity: 0;\n }\n to {\n opacity: 1;\n }\n }\n\n @-o-keyframes fadein {\n /* Opera */\n from {\n opacity: 0;\n }\n to {\n opacity: 1;\n }\n }\n\n </style>\n</head>\n<body>\n <div id=\"message\">\n <img src=\" data:image/png;base64,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
Docker Hub建议使用sundardocker/testrepo1作为存储库名称：sundardockers/testrepo1