Problem with the panigation, only two pages are scraped

Describe the problem.

Url: http://www.maxwellrender.com/materials/

I tried the elementClick selector

Sitemap:
{"_id":"render","startUrl":["http://www.maxwellrender.com/materials/"],"selectors":[{"id":"item","type":"SelectorElementClick","selector":"div.material-list-item","parentSelectors":["_root"],"multiple":true,"delay":"4000","clickElementSelector":"li.page-item:nth-of-type(n+4) a.page-link, div.text-center div","clickType":"clickOnce","discardInitialElements":true,"clickElementUniquenessType":"uniqueText"},{"id":"title","type":"SelectorText","selector":"div.material-name","parentSelectors":["item"],"multiple":false,"regex":"","delay":0}]}

The method introduced in panigation tutorial "https://www.youtube.com/watch?v=y_n2IsZlLds"

{"_id":"render","startUrl":["http://www.maxwellrender.com/materials/"],"selectors":[{"id":"panigation","type":"SelectorLink","selector":"li.page-item:nth-of-type(n+4) a.page-link","parentSelectors":["_root","panigation"],"multiple":true,"delay":0},{"id":"item","type":"SelectorElement","selector":"div.material-list-item","parentSelectors":["panigation"],"multiple":true,"delay":0},{"id":"title","type":"SelectorText","selector":"div.material-name","parentSelectors":["item"],"multiple":false,"regex":"","delay":0}]}

Only the first page can be scrapped. Can anybody give me some tips ?