java.lang.VerifyError on method that worked a minute ago

Question

Apologies in advance but I have never seen this error before and don\'t know what to include. I am using NetBeans and suddenly began getting this error:

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Answer 1

Just try putting a super() at the beginning of your constructor as the error states.

I thought it was usually inferred and added without the constraint to write it, maybe the superclass of CostOperations doesn't have any empty constructor..