Td: 400 Can't lock file

[funk-yourself]

Occures when I send setTdlibParameters (after receiving updateAuthorizationState with type of authorizationStateWaitTdlibParameters, of course).

[ 3][t 3][1525341790.876738548][Td.cpp:4633][!Td][&td_requests] Sending update: updateAuthorizationState {
  authorization_state = authorizationStateWaitTdlibParameters {
  }
}

[ 3][t 3][1525341800.785206556][Td.cpp:4663][!Td][&td_requests] Sending error for request 1: error { code = 400 message = "Can't lock file" }

There's no error when I change database_directory to another path (though old path worked well some time ago).

What could be the reason for such behaviour?

P.S. File permissions seem to be correct and are the same for both directories I mentioned.

[zevlg]

It might be another instance of your application already running on that directory

[funk-yourself]

Yeah, there was a zombie-client which was locking file.