I have setup Android studio and created a sample app project. When I right click and validate the AndroidManifest.xml, I see the below 4 errors:

Error:(3, 47) cvc-elt.1: Cannot find the declaration of element 'manifest'.
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:(1, 56) s4s-elt-invalid: Element 'x' is not a valid element in a schema document.
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>.

These validation errors appear for all the projects in the workspace and none of the uses-permissions declared in the manifest tag are recognized.

I uninstalled Android Studio, re installed and reconfigured, still facing the same issue. Please advice.