https://trailhead.salesforce.com/content/learn/modules/lex_dev_lc_basics/lex_dev_lc_basics_create

 I've know idea how to resolve this Challenge anybody can you give me a Hint or Solution.kindly let us know if any

There was an unhandled exception. Please reference ID: OMPWBZKK. Error: Faraday::ClientError. Message: MALFORMED_QUERY: When retrieving results with Metadata or FullName fields, the query qualificatio​ns must specify no more than one row for retrieval. Result size: 2

They showing pop_up like FIELD INTEGRITY EXCEPTION 
Failed to save mycontactlist.cmp: Invalid definition for null:mycontactlistcontroller: null: Source.
when i trying so many same error coming in trailhead quick start:create a lightning component. kindly resolve the issue ASAP

Using a Standard List Controller, create a Visualforce page which displays a list of Accounts with links to their respective record detail pages.
The page must be named 'AccountList'.
It must reference the Account standard controller.
It must have a recordSetVar equal to 'accounts'.
It must have a Visualforce apex:repeat component.
The repeater must have the var attribute set to 'a'.
The repeater must use the <li> HTML list tag
The repeater must use the apex:outputLink component to link to the respective record detail page
HINT: Record detail pages can be reached by placing a record ID at the root of the URL (e.g. '/<record id>').
 

There was an unhandled exception. Please reference ID: OMPWBZKK. Error: Faraday::ClientError. Message: MALFORMED_QUERY: When retrieving results with Metadata or FullName fields, the query qualificatio​ns must specify no more than one row for retrieval. Result size: 2

They showing pop_up like FIELD INTEGRITY EXCEPTION 
Failed to save mycontactlist.cmp: Invalid definition for null:mycontactlistcontroller: null: Source.
when i trying so many same error coming in trailhead quick start:create a lightning component. kindly resolve the issue ASAP

Using a Standard List Controller, create a Visualforce page which displays a list of Accounts with links to their respective record detail pages.
The page must be named 'AccountList'.
It must reference the Account standard controller.
It must have a recordSetVar equal to 'accounts'.
It must have a Visualforce apex:repeat component.
The repeater must have the var attribute set to 'a'.
The repeater must use the <li> HTML list tag
The repeater must use the apex:outputLink component to link to the respective record detail page
HINT: Record detail pages can be reached by placing a record ID at the root of the URL (e.g. '/<record id>').
 

Hi,

Trailhead: https://trailhead.salesforce.com/projects/quickstart-lightning-components/steps/quickstart-lightning-components3

Problem saving MyContactList.cmp.
Field_Integrity_Exception: Failed to save MyContactList.cmp: Invalid definition for null:MyContactListComponent: null: Source

MCLC.apxc:
public class MyContactListController {
@AuraEnabled
public static List<Contact> getContacts(Id recordId) {
   return [Select Id, FirstName, LastName, Email, Phone From Contact Where AccountId = :recordId];
}
}

MCL.cmp:
<aura:component controller="MyContactListComponent" implements="flexipage:availableForRecordHome,force:hasRecordId" access="global" >
<aura:attribute name="recordId" type="Id" />
<aura:attribute name="Account" type="Account" />
<aura:attribute name="Contacts" type="Contact" />
<aura:attribute name="Columns" type="List" />
<force:recordData aura:id="accountRecord"
                  recordId="{!v.recordId}"
                  targetFields="{!v.Account}"
                  layoutType="FULL"
                  />
<lightning:card iconName="standard:contact" title="{! 'Contact List for ' + v.Account.Name}">
    <!-- Contact list goes here -->
</lightning:card>
</aura:component>



Anyone any idea or suggestion to help?

Thank you, regards, albert

Hi,
Does anyone know why Lightning Components trail got closed?
When I am clicking on it they are showing Trai Closed message.
Thank you,
Amit