Your comments

Just for information,

I installed 2017 and it solved everything. I think 2018 has issues in itself because even it has no standart assets download with it. May be the problem was it but not sure.

Any way 2017 has no issues. Stable version has no problem, problem solved.

Himm, may be my Unity knowledge is not enough to answer this question.  l ll be come back if I need.