invalid message type

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I try to use my own messages. I created msg file named RopEvent:

 int32 value
 string name
 string comment

I can't publish message using rostopic pub. I try to proceed

rostopic pub rop_client rop_client/RopEvent 14 "Test" "Test"

But I receive an error

ERROR: invalid message type: rop_client/RopEvent.
If this is a valid message type, perhaps you need to type 'rosmake rop_client'

I type this, it makes package correctly, but message error still pops up. If I type rostopic list -v, I can see a string

* /rop_client [rop_client/RopEvent] 1 subscriber

'rosmsg list' shows me that my message exists, 'rosmsg show' finds message and shows it. What's wrong?