ERR_TOO_MANY_REDIRECTS , I need some help

[Rosie Posy]

Hello I would appreciate any help. I get the following error message. When I click on the customer order on the orders tab in prestashop 1.6 the page does not open, I get the following error message;  

​'​

Try clearing your cookies.

ERR_TOO_MANY_REDIRECTS

​''​

I tried clearing the cache in prestashop 1.6 on the 

​'​

performance

​' ​

 page 

​(top right hand corner) ​

but get the '

​'​

504 Gateway Time-out

The server didn't respond in time. 

​

 

I also cleared cookies in Google chrome and tried internet explorer but the error message remains. 

 

​

​any ideas? 

I can not process any orders.

Thanks for your help, 

Kind regards

Len