I cannot complete the Subscribe to Platform Events challenge. When I click the 'Check Challenge' button I get the following error:

Publishing an Order_Event__e did not create the associated task successfully. Please check your trigger and event.

Here is my code:

trigger OrderEventTrigger on Order_Event__e (after insert) {
    // List to hold all tasks to be created.
    List<Task> tasks = new List<Task>();
    
    // Get queue Id for case owner
    String usr = UserInfo.getUserId(); 
        
       
    // Iterate through each notification.
    for (Order_Event__e event : Trigger.New) {
        if (event.Has_Shipped__c == true) {
            // Create Task to dispatch new team.
            Task t = new Task();
            t.Priority = 'Medium';
            t.Status = 'New';
            t.Subject = 'Follow up on shipped order' + event.Order_Number__c;
            t.OwnerId = Usr;
            tasks.add(t);
        }
   }
    
    // Insert all tasks corresponding to events received.
    insert tasks;
}

Please assist. Thanks. 

Create a Visualforce page without the standard Salesforce header and display an image using the Visualforce image component.
The page must be named 'DisplayImage'.
It must NOT display the standard Salesforce header.
It must use a Visualforce apex:image component to display this image - https://developer.salesforce.com/files/salesforce-developer-network-logo.png

<apex:page showHeader="false" title='DisplayImage'> 
    <apex:pageBlock >
        <apex:image url="https://developer.salesforce.com/files/salesforce-developer-network-logo.png"/>
    </apex:pageBlock> 
</apex:page>

Challenge Not yet complete... here's what's wrong: 
The 'DisplayImage' page was not found.

Hello Communty

I am trying to complete this challenge:

To pass this challenge, create a custom button which opens a link to 'http://google.com?q=<CONTACT NAME>' - where <CONTACT NAME> is the current contact's name. Then add this button to the default 'Contact Layout'.
The custom button must be labeled 'Google Info' with the name 'Google_Info'.
The custom button must dynamically insert the contact's name using the appropriate merge field.
The custom button must be added to the 'Contact Layout' page layout.


But keep getting this error: 

Challenge Not yet complete... here's what's wrong: 
The 'Google Info' custom button was not found. Hint: Make sure that it is a Detail Page Button (not link) and that its added to the page layout.

Please view the seenshot.

What am i doing wrong? Thanks for your help! 

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.