Unable to verify gstr1 (invoices already submitted error)

Anshu (Student) (96 Points)

04 September 2017  

Hi Everyone,

I have submitted my GSTR1 Return but when i am trying to verify that refurn by EVC, i get OTP but when i enter that OTP i get error message saying "Invoices already submitted". 

Please let me know what does that mean and how can i verify my retun?

Thanks for you help.