Problem with sendmany: json value is not a boolean as expected

sendmany: unable to send 39.79986691 error -1: json value is not a boolean as expected {"DCkbeYcWHXfujucxfDwcasrCZ9ZhYBb1jt":36.29054213,"DLyU8qaemqmuzrqWZXmQJWSoqT25rSmX7r":3.26768307,"D7Sys2sDxtgU1UR5nhMLrCzR6sd6CBHkWq":0.24164171}

Do anybody know, what is wrong with this request?