BAD_SIGNATURES, Number of signatures does not match number of inputs

[vladislavmamchich]

When I call function signTxProposal, I have message "Error: BAD_SIGNATURES: Bad signatures".
In BWS logs are:
verb Error: Number of signatures does not match number of inputs
WARN <2cbea2f0-99a8-4eb0-a863-651f4a157942> Error signing transaction (BAD_SIGNATURES)
...
info Client Err: 400 /v1/txproposals/4a340867-057c-4fd1-b3b8-f85aaab25490/signatures/ {"code":"BAD_SIGNATURES","message":"Bad signatures"}
API.signTxp = function(txp, derivedXPrivKey) return []