There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org.

We're having trouble with the "Extending Reports using the AppExchange" module in Trailhead

We keep getting the same error when checking the challenge at the end of the module:

Challenge not yet complete... here's what's wrong: 
The 'LEAD Trend by Source' dashboard component does not have the wedges set to 'Lead Source'.

Wedges ARE set to 'Lead Source', did anybody get this error message? do you know what the solution may be? Thank you!

Hello,
For below challenge, 
To complete this challenge, add a validation rule which will block the insertion of a contact if the contact is related to an account and has a mailing postal code (which has the API Name MailingPostalCode) different from the account's shipping postal code (which has the API Name ShippingPostalCode).Name the validation rule 'Contact must be in Account ZIP Code'.
A contact with a MailingPostalCode that has an account and does not match the associated Account ShippingPostalCode should return with a validation error and not be inserted.
The validation rule should ONLY apply to contact records with an associated account. Contact records with no associated parent account can be added with any MailingPostalCode value. (Hint: you can use the ISBLANK function for this check)

I create validation rule as below.

Rule Name: Contact_must_be_in_Account_ZIP_Code Active [Checked]
Error Condition Formula: IF( AND(NOT( ISBLANK( AccountId )) ,NOT(ISBLANK( MailingPostalCode ))) , IF( MailingPostalCode = Account.ShippingPostalCode , false, true) , false)
Error Message: Contact must be in Account ZIP Code Error Location: Mailing Zip/Postal Code
Description: Contact must be in Account ZIP Code

trailhead check challenge is giving below error.
Challenge not yet complete... here's what's wrong: 
The validation rule failed to enforce the business logic

can some one help on finding the solution.
thanks in advance.

Greetings, I cannot seem to get this to work. I have my var set to cs, as it only works with that, rather, as I attempt to set it, I get the error message of var not set correctly. Please advise. Here's the code. The apex code appears correct.

<apex:page controller="NewCaseListController">
    <apex:form >
        <apex:pageBlock title="Case List" id="Case_list">
         <apex:repeat value="{!NewCases}" var="cs">
         <table style="width:1000px;">
          
<tr>
 <apex:repeat value="{!NewCases}" var="cs">
        <apex:outputLink value="https://na16.salesforce.com/{!cs.Id}">{!cs.CaseNumber}</apex:outputLink>
         <apex:outputLink value="{!cs.CaseNumber}">{!cs.CaseNumber}</apex:outputLink>
        </apex:repeat> 
             </tr>
        </table>
             </apex:repeat>
        </apex:pageBlock>
    </apex:form>
</apex:page>