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nkuhan1.3904588185033828E12nkuhan1.3904588185033828E12 

FIELD_INTEGRITY_EXCEPTION

According to Lightning Components Developer’s Guide (https://developer.salesforce.com/docs/atlas.enus.lightning.meta/lightning/qs_aotp_app_step2_cmp.htm (https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/qs_aotp_app_step2_cmp.htm))

I am trying to create a new component, form.cmp. but I am unable to save form.cmp , I already Register a Namespace Prefix and Enable Lightning Components checkbox 

I got the following error , please help me on this 
FIELD_INTEGRITY_EXCEPTION
Failed to save undefined: No TYPE named apex://namespace.Expense__c found : [markup://kuhan:form]: Source

when I change the namespace to kuhan(kuhan is my namepace) I got the following error
FIELD_INTEGRITY_EXCEPTION
Failed to save undefined: No TYPE named apex://kuhan.Expense__c[] found : [markup://kuhan:form]: Source
 
nkuhan1.3904588185033828E12nkuhan1.3904588185033828E12
I can sort it out , I didn't create the Expense object 
Now I am following pdf version of Lightning Components Developer’s Guide 
pdf version is good to follow for beginners , because you won't skip the steps like online version