Has anyone verified contracts on a blockscout?

I get this message back from the Velas browser, I should clarify that I have verified the same contract on 4 or 5 other networks with no problems.
the main contract has:

pragma abicoder v2;

and I have tried changing it to

experimental pragma ABIEncoderV2;

but still with this message:

There was an error compiling your contract: the ABI encoder has already been selected for this source unit.