ANSYS CFD Fluent

Created by Ananth Narayan on 4 September, 2018

The mesh generation did not complete due to poor quality elements or incorrect input. Please try meshing with another mesh method or different mesh options.

i am using ansys 2020 r1, i drew a 2d geometry and meshed but got the error like this please help me:
The mesh generation did not complete due to poor quality elements or incorrect input. Please try meshing with another mesh method or different mesh options.