You should check this with the people who created that wallet application. Invalid sender is a custom error that they created and unless their code is open source, we wouldn't be able to tell why it is throwing that error.
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it is not only in this wallet but also in others that I use as well.
I can send you a transaction error code from myetherwallet maybe you will see something there
And by the way, I cannot import the private key into other wallets only into a couple of wallets, in other wallets it says that the private key is invalid.
Off topic. This is a smart contract development forum.