Can't sync shared library on Server(v5) with Client(v6)

Hi. I can’t sync shared library on server (v 5.1.4) with my local folder using seafile-client (v 6.0.0). Tried both - Win7 and linux (ubuntu). Log-file contains errors:

[11/22/16 12:56:51] seaf-daemon.c(548): starting seafile client 6.0.0
[11/22/16 12:56:51] seaf-daemon.c(550): seafile source code version bea8cc526ed37b8c9599e5f526d934c8ec90d288
[11/22/16 12:56:51] …/common/mq-mgr.c(60): [mq client] mq cilent is started
[11/22/16 12:56:51] …/common/mq-mgr.c(106): [mq mgr] publish to heartbeat mq: seafile.heartbeat
[11/22/16 12:57:03] clone-mgr.c(819): Transition clone state for e3c857ac from [init] to [connect].
[11/22/16 12:57:03] http-tx-mgr.c(1113): Bad response code for GET http://[xxx:yy]/seafhttp/protocol-version: 404.
[11/22/16 12:57:03] clone-mgr.c(837): Transition clone state for e3c857ac from [connect] to [error]: connect.

Downloading and uploading files to this library in web interface works good.