Unable to load world
 

I have noticed that others have run across this error and have been able to receive help. I was wondering if anyone could help me solve this issue. I have attached the file. I turned this world in for school only to be notified that the world will not open. I tried and got this error:

Unable to load world

Alice version: 2.3.5

os.name: Windows 7

os.version: 6.1

os.arch: x86

java.vm.name: Java HotSpot(TM) Client VM

java.vm.version: 20.0-b11

user.dir: F:\APUS Year 1\ENTD 211\Alice 2.3\Required



Throwable that caused the error:

edu.cmu.cs.stage3.alice.core.IllegalNameValueException: Unfortunately, something else in this world is already named "index," so you can't use that name here.

at edu.cmu.cs.stage3.alice.core.Element.checkForNameCollision(Element.java:222)

at edu.cmu.cs.stage3.alice.core.Element.internalSetParent(Element.java:690)

at edu.cmu.cs.stage3.alice.core.Element.insertChildAt(Element.java:1060)

at edu.cmu.cs.stage3.alice.core.Element.addChild(Element.java:1068)

at edu.cmu.cs.stage3.alice.core.Element.setParent(Element.java:651)

at edu.cmu.cs.stage3.alice.core.response.LoopNInOrder.loadCompleted(LoopNInOrder.java:59)

at edu.cmu.cs.stage3.alice.core.Element.loadCompleted(Element.java:1439)

at edu.cmu.cs.stage3.alice.core.Element.loadCompleted(Element.java:1439)

at edu.cmu.cs.stage3.alice.core.Element.loadCompleted(Element.java:1439)

at edu.cmu.cs.stage3.alice.core.Element.loadCompleted(Element.java:1439)

at edu.cmu.cs.stage3.alice.core.Element.loadCompleted(Element.java:1439)

at edu.cmu.cs.stage3.alice.core.Element.load(Element.java:1569)

at edu.cmu.cs.stage3.alice.authoringtool.dialog.LoadElementProgressPane.construct(LoadElementProgressPane.java:42)

at edu.cmu.cs.stage3.progress.ProgressPane$2.run(ProgressPane.java:86)

at java.lang.Thread.run(Thread.java:662)


All backups say the same thing. Please let me know if this can be saved or if I should try to recreate the world. Thank You for any help.