Solved
Thanks Rao,
But my content type was already application/json. I got the solution for this issue. There is a setting in Test case options with check box as "Diaply OK Result". If I unchecked it, I am able to see request and response.
Another root cause found:
In one REST testStep I use properties from previous disabled testStep. SoapUI try to parse null file of previous testStep and get error. I deleted it and have no errors now.