Hi how you doing?
Have ever met such error when using http://blockcypher.com
"Mismatch between number of public keys and signatures"

It sounds like either

1) you try to spend bitcoins from multiple addresses in one transaction (which is possible with all wallets, if you import multiple private keys then send a large amount, but I dont know if it is possible with coinbin)
2) you try to spend from a multisig address (https://en.bitcoin.it/wiki/Multisignature, address begins with 3 not 1) but you didnt sign the tx with all private keys. Some 2fa wallets generate multisig addresses and multisig (generally 2-of-3 multisig) can also be used for escrow transactions (buyer, seller and escrow have their own private key, and 2 people need to sign the tx in order to spend funds).

I would recommend to generate the transaction again and ensure that it is signed with all relevant private keys (wallets should do this automatically if the private keys are imported, or you can use bitcoind with a full or remote node: https://gist.github.com/gavinandresen/3966071, https://bitcoin.org/en/developer-reference#createmultisig)