Error:(1, 56) schema_reference.4: Failed to read schema document 'null', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
Error:(1, 56) s4s-elt-invalid: Element 'x' is not a valid element in a schema document.
Error:(1, 56) s4s-elt-schema-ns: The namespace of element 'x' must be from the schema namespace, 'http://www.w3.org/2001/XMLSchema'.
Error:(7, 68) cvc-elt.1.a: Cannot find the declaration of element 'android.support.constraint.ConstraintLayout'.
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