Error 520 at Admin Tab pagination

[m-graphix]

Hi guys, I have Prestashop 1.4.7 and I get a weird error 520 in Admin section when trying to repaginate multiple entries. For example in Shipping -> Counties you get the list of all countries. By default 50 entries are displayed, but you can either display 20, 50, 100, 300 or just advance to the next page using the arrows.

Well, if I click on next arrow or choose a different display number and Filter, I get the Errror 520 page.

 

This happens to any tab in Admin section that has more than one page of entries to display - Countries, States, Price Ranges, Weight Ranges, Tools -> Stores etc. So it's an interface error.

 

I will mention the site is duplicated from another site and the original works fine. I tried rewriting all the files again from the original site and I still get the error. I tried even switching hosts with the same result.

 

The only thing I can think of is a cache/cookie error, but how can I diagnose such things? I tried disabling the cache and Force Compile, same result...

 

Any help is appreicated.

[tuk66]

Do you mean Error 500? What is the wrong "next page" URL?

[m-graphix]

The error appears when I click on "Next" arrow to display the second page of entries. And it happens to any tab in the admin section that has more than 1 page of entries to display.

[m-graphix]

Anyone has any insights into this error?