Keyur Kanade
Ansys Employee
From image it does not look STL. 
If it is not STL then - 
The min orthogonal quality should be above 0.1 to proceed to solver. If it is less than 0.1 then please improve the mesh. 
First check the locations of the bad elements. Please see following video for the same. 
Once you have locations, please check if you can improve mesh using different mesh sizing. Please see following video. 
You can see more information about sizing at following link.
If this does not help, you may need to check if you can use pinch control or virtual topology. 
If this does not help, please go to geometry and modify or simplify geometry at those locations in SpaceClaim. 
If geometry is in STL then it will be good to work in Fluent Meshing. 
Please go through help manual for more details