Doesn't let me edit a page

Hi,

Somehow I’m not able to access the edit section of one page. This page shows normally online but when I click edit, it just takes me to a grey page. I have tried to access the editor from different place but nothing works. At the end of the page there is also some extra code as it shows this at the end: ][/wr_column]

https://www.ads-software.com/plugins/wr-pagebuilder/