Hello Community, 

Need some assistance with and error on a VisualSource Page Trailhead Challenge

Here is the Criteria:
Create a page which displays a subset of Opportunity fields using apex:outputField components. Bind the Name, Amount, Close Date and Account Name fields to the apex:outputField components.The page must be named 'OppView'.
It must reference the Opportunity standard controller.
It must have an apex:outputField component bound to the Opportunity Name.
It must have an apex:outputField component bound to the Opportunity Amount.
It must have an apex:outputField component bound to the Opportunity Close Date.
It must have an apex:outputField component bound to the Account Name of the Opportunity.

Here is the error I'm receiving
Challenge not yet complete... here's what's wrong: 
The page does not include a apex:outputField component bound to the opportunity name

Here is my code for the page:
<apex:page standardController="Opportunity" >
    
    <apex:pageBlock title="Opportunities">
        <apex:pageBlockSection>
        <apex:outputField value="{! Opportunity.Account.Name}"/>
        <apex:outputField value="{! Opportunity.Amount }"/>
        <apex:outputField value="{! Opportunity.CloseDate }"/>
        <apex:outputField value="{! Opportunity.Accountid }"/>
        
         </apex:pageBlockSection>
    </apex:pageBlock>
</apex:page>

Please Advise Community!!

Hello All,
I am stuck in below trailhead chanllange. Please help me.

Using the Contact standard controller, create a Visualforce page which displays a Contact's First Name, Last Name and the Email address of the Contact's Owner.The page must be named 'ContactView'.
It must reference the Contact standard controller.
It should include a bound variable that uses the standard controller to display the first name of the Contact.
It should include a bound variable that uses the standard controller to display the last name of the Contact.
It should include a bound variable that uses the standard controller to display the Contact Owner's email.

I am getting below error..
Challenge not yet complete... here's what's wrong:
The page does not include a bound first name variable for the Contact record
Please refer below screenshot for vf code.