Error to open .ply file [closed]

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Hi, I want to convert my rosbag file into ply file. I have velodyne data in rosbag file format that i can convert into pcd file with help of

 rosrun pcl_ros bag_to_pcd <input_file.bag> <topic> <output_directory>

That gives me multiple pcd file that is converted in ply file using:

pcl_pcd2ply input_file.pcd output_file.ply

but conversion is not completed it gives error to open in MeshLab:

While opening: '/home/nikka/Velo1.ply'

Error encountered while loading file: "/home/nikka/Velo.ply" Error details: Unespected eof

I am not getting what went wrong ? is the erro in bag2pcd or error in pcd2ply ???

can anyone plz help me with this...