Hello Dinesh,
Glen from Drag & Drop Multiple File Upload CF7 was fixed his PlugIn that it works with your and Contact Form 7.
He wrote:
Hello Tilo,
I was able to fix the issue, russ was right the script error is caused by the Jquery Validation For Contact Form 7 Pro plugin. ( not standard )
That plugin override the default functionality of Contact Form 7 to manipulate each field for validation.
So, what I did I've updated my script not to defend Contact Form 7 script.js because it's conflict with the said plugin.
Please confirm and check on your end and let me know if you have any question.
Regards,Glen
If you fixed your PlugIn, please let me and him to know.
Thanks
Tilo