Error when checking 'Using Expressions' challenge

I realise this question has been asked a few times already but couldn't find any suggested solution that worked for me, so here goes.....

I am currently trying to complete the 'Using Expressions' challenge on the Trailhead Lightning site, and keep getting the same error.

Code
Component
<aura:component >
<aura:attribute name="IsSunday" type="Boolean" default="false"/>
<aura:attribute name="IsMonday" type="Boolean" default="false"/>
<aura:attribute name="IsTuesday" type="Boolean" default="false"/>
<aura:attribute name="IsWednesday" type="Boolean" default="false"/>
<aura:attribute name="IsThursday" type="Boolean" default="false"/>
<aura:attribute name="IsFriday" type="Boolean" default="false"/>
<aura:attribute name="IsSaturday" type="Boolean" default="false"/>

<aura:handler name="init" value="{!this}" action="{!c.doInit}"/>

<aura:if isTrue="{!v.IsSunday}">
Today is Sunday
</aura:if>
<aura:if isTrue="{!v.IsMonday}">
Today is Monday
</aura:if>
<aura:if isTrue="{!v.IsTuesday}">
Today is Tuesday
</aura:if>
<aura:if isTrue="{!v.IsWednesday}">
Today is Wednesday
</aura:if>
<aura:if isTrue="{!v.IsThursday}">
Today is Thursday
</aura:if>
<aura:if isTrue="{!v.IsFriday}">
Today is Friday
</aura:if>
<aura:if isTrue="{!v.IsSaturday}">
Today is Saturday
</aura:if>
</aura:component>

CONTROLLER
({
 doInit : function(component) {
 var theDate = new Date();
if (theDate.getDay()==0) {component.set("v.IsSunday", true);}
if (theDate.getDay()==1) {component.set("v.IsMonday", true);}
if (theDate.getDay()==2) {component.set("v.IsTuesday", true);}
if (theDate.getDay()==3) {component.set("v.IsWednesday", true);}
if (theDate.getDay()==4) {component.set("v.IsThursday", true);}
if (theDate.getDay()==5) {component.set("v.IsFriday", true);}
if (theDate.getDay()==6) {component.set("v.IsSaturday", true);}
 }
})

ERROR
Challenge not yet complete... here's what's wrong:
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 recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: ZPWCUPZG

I tried creating a new Developer edition, as per a suggestion on another thread, but got the same error (albeit with a different error id).

I went back to my original developer edition and tried another suggestion - modifying the code in my component to have only one <aura:if> statement and one <aura:set attribute....> tag, as shown below:

<aura:component >
<aura:attribute name="IsSunday" type="Boolean" default="false"/>
<aura:attribute name="IsMonday" type="Boolean" default="false"/>
<aura:attribute name="IsTuesday" type="Boolean" default="false"/>
<aura:attribute name="IsWednesday" type="Boolean" default="false"/>
<aura:attribute name="IsThursday" type="Boolean" default="false"/>
<aura:attribute name="IsFriday" type="Boolean" default="false"/>
<aura:attribute name="IsSaturday" type="Boolean" default="false"/>

<aura:handler name="init" value="{!this}" action="{!c.doInit}"/>

<aura:if isTrue="{!v.IsSunday}">
Today is Sunday
<aura:set attribute="else">
Today is not Sunday
</aura:set>
</aura:if>





</aura:component>

Same end result:
Challenge not yet complete... here's what's wrong:
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 recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: MEEOAPTN

Any help would be appreciated. have spent quite a lot of time on this already!

August 4, 2015
·
Answer
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William Tran
For this exercise, I believe you don't need to get that complicated:

Something like simple should do it. The controller is not even needed

Thx
<aura:component > <aura:attribute name="DayOfTheWeek" type="String" default="Monday"/> <aura:if isTrue="{!v.DayOfTheWeek =='Monday'}" > <aura:text value="{! 'Today is' + v.DayOfTheWeek}"/> </aura:if> </aura:component>

The key is to use an expression.

August 5, 2015
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0

Alastair Scollay 8
Thanks for the feedback, William. You're probably right about my over-complicating the answer!

For what it's worth, the error message turned out to be something of a red herring. I thought that there was some kind of issue with my environment. In fact, what actually ended up fixing it was simply changing all my attribute/variable names to those specified in the challenge. For example, instead of using 'v.IsSunday', 'v.IsMonday' etc....I used v.DayOfTheWeek and set it to "Sunday", or "Monday" etc...

Similarly, in the component, I changed the test from <aura:if isTrue="{!v.IsSunday}">.....to <aura:if isTrue="{!v.DayOfTheWeek=='Sunday'}">

Hope this helps anyone else who has run into the same issue.