Parse error: syntax error, unexpected '::'

There was error on loading of otobil_model but instead of showing me that error I got "Parse error: syntax error, unexpected '::'" this error.
When I fixed model loading error this error is gone.

So the result is,  there is nothing to prevent us using this way: $this->otobil_model::CONSTANT_NAME

As it turns out PHP 5.6 does not  support $this->otobil_model::CONSTANT_NAME this type of referencing.
I got this error because of I had a 5.6 PHP installed and when I run it on PHP 7.0 it worked;