I am filing the regular period which HMRC are expecting. My VAT is the same it always has been.

This morning I spoke to a representative on your helpline. She advised me to upgrade to 2019 version as the MTD doesnt work on 2018.

I have done this and I am still getting the same message

"the submission of this document has failed due to departmental specific ....

Pls Pls help, what do i need to do now?