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keshin okawakeshin okawa 

Expense Tracker (error: "e is null" when submitting)

I followed the steps from here @ and an error "e is null" shows everytime I clicked submit but it adds new portions(each new expense) in the button with blank values. I tried using console.log and it displays values. I also already added the custom object with the fields. The only difference I have from the given codes is that I don't use namespace. I hope anyone who has the same issue or has any idea how to solve this..pls do share here...
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ShashankShashank (Salesforce Developers) 
It could be due to the namespaced bootstrap static resource "bootstrap-namespaced.min.css". Please try the other one  "bootstrap.min.css"