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Error Code 388


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I tried to submit my 2021 T2 file but Error code appeared, it is 388.

Error said "CRA cannot process the return transmitted since the tax period for this return overlaps an existing tax period for a return already assessed. 

I contacted CRA and it said no overlaps and cannot find any problem.

Ufile support gave me some advice but all didn't work. NETFile review page said I can send my file electronically. But it cannot.

Could somebody help me to solve this problem? Thank you

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