Unable to save or create new products (911 !!!)

Hi,

I am not able to save or create or modify products in my website. Each time i try to create new product (tour) or modifiy product, the system dont work and redirect to ARTICLES. I dont knoe why !

My client want to fix that rush because she is not able to create new tour, or variables products or simply edit product and save.

Can you help me please ?

Thanks