Fatal error: Cannot use object of type WP_Post as array in C:\xampp\htdocs\wordpress-4.3.1\wp-includes\query.php on line 3716
I don't know what is this I am searching from internet but not find the solution
This error is telling you that a post object has been passed into a function or method where an array was expected. The file you cited is the location there whe error was reported. Use a stack trace to determine where the error originated from to solve your problem.