products are not showing

[charlestcr]

in my prestashop control panel

when clicking on - Catelog-Products- i can see products   50/ 205 result(s)...

But when clicking display dropdwn  100/205  results in error

or  any other  (x/205)  results in error

or clicking second page(2) ,3,4,..results in error

or clicking  previous,Next,first,last button  result in error .

how to solve this issue? ............

 

 this issue is not only for produts...all gridviews showing this issue...