Thank you Kyle,
Ninja Forms is a good plugin and has a great team. After some more intensive tests I found the problem in the theme files.
Thank you for the support and fast reply.
The Ninja Forms is working and is great!!!
Thanks!
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This reply was modified 9 years, 8 months ago by wpdesign13. Reason: The plugin is working, Thanks!
This issue was resolved.
Thanks to Support and developers for the reply (the reply was by the developers website).