Unable to extract schema for operation writesf0 and target Namespace

Summary:

We are creating an Integration with StageFile action (write) by uploading the xsd schema. But we are facing the below Error "Unable to extract schema for operation writesf0 and target Namespace http://ivaservizi.agenziaentrate.gov.it/docs/xsd/fatture/v1.2"

I have included the Integration which is in Project (.car) also the XSD schema.

Content (please ensure you mask any confidential information):

<fault
xmlns="http://www.oracle.com/2014/03/ics/fault">
<errorCode>SF1001</errorCode>
<reason>Error occurred while processing activity stageWritesf0. Error : Unable to extract schema for operation writesf0 and target Namespace http://ivaservizi.agenziaentrate.gov.it/docs/xsd/fatture/v1.2</reason>