Title element doesn't work with Action Element in Manifest XML

Question

I am creating an add-in for Microsoft Word.

I am getting manifest validation error for Title element inside Action element.

Microsoft Reference documentation for Action Element

Error #1:
XML Schema Violation: Your manifest does not adhere to the current set of XML schema definitions for Office Add-in manifests. (link: https://aka.ms/add-in-manifest-schema-violation)
  - Details: The element 'Action' in namespace 'http://schemas.microsoft.com/office/taskpaneappversionoverrides' has invalid child element 'Title' in namespace 'http://schemas.microsoft.com/office/taskpaneappversionoverrides'. List of possible elements expected: 'TaskpaneId, SourceLocation' in namespace 'http://schemas.microsoft.com/office/taskpaneappversionoverrides'.
  - Line: 54
  - Column: 22

Example:

    <Action xsi:type="ShowTaskpane">
       <Title resid="Contoso.Taskpane.Title" />  --> //Adding this line throws error 
       <TaskpaneId>ButtonId1</TaskpaneId>
       <SourceLocation resid="Contoso.Taskpane.Url" />
   </Action>

Could someone help me here?

Answer 1

The validator checks the order in which the XML elements appear.

Please use the code below:

   <Action xsi:type="ShowTaskpane">
      <TaskpaneId>ButtonId1</TaskpaneId>
      <SourceLocation resid="Contoso.Taskpane.Url" />
       <Title resid="Contoso.Taskpane.Title" />  -->  
   </Action>