Attribute is not serializable as xml 1.0 
Autore: J. LombaTengo muchos errores de estos en mi web, me gustaria saber como solucionarlos.
Gracias
Info: The Content-Type was text/html. Using the HTML parser.
Info: Using the schema for HTML with SVG 1.1, MathML 3.0, RDFa 1.1, and ITS 2.0 support.
Error: Saw < when expecting an attribute name. Probable cause: Missing > immediately before.
At line 36, column 8
</head>↩ <body <!-- Google Tag
Warning: Attribute <!-- is not serializable as XML 1.0.
From line 36, column 2; to line 36, column 34
</head>↩<body <!-- Google Tag Manager -->↩<nosc
Warning: Attribute -- is not serializable as XML 1.0.
From line 36, column 2; to line 36, column 34
</head>↩<body <!-- Google Tag Manager -->↩<nosc
Error: Attribute <!-- not allowed on element body at this point.
From line 36, column 2; to line 36, column 34
</head>↩<body <!-- Google Tag Manager -->↩<nosc
Attributes for element body:Global attributesonafterprintonbeforeprintonbeforeunloadonhashchangeonmessageonofflineononlineonpagehideonpageshowonpopstateonresizeonstorageonunload
Buongiorno,
credo che dipenda dal fatto hai inserito il codice in una sezione non corretta.
Infatti risulta all'interno del tag <body>
prova a rimuovere il codice di gogole tag manager e verificare. poi inseriscilo selezionando "dopo l'apertura del body"
Spero di esserti stato utile.
***** Google Translation:
Buenos días,
Yocreo que es porquehas introducidoel códigoen una secciónno es correcta.
Es dentro dela etiqueta <body>
intente eliminar elgestor dela etiquetade códigogogoley comprobar.a continuación,entrar en élmediante la selección de""Después de laapertura del body"
Espero serútil.