Error 0001: trouble contacting crawling server.

I am using wp google review slider with the Crawl Google Review Page method, but I get the following error:

Error 0001: trouble contacting crawling server. Please try again or contact support. CMD: https://crawl.ljapps.com/crawlrevs?rip=35.214.220.230&surl=https%3A%2F%2Fwww.himalayatrek.it&stype=googlecheck&scrapequery=ChIJq6q6WpFaJRMRGAS9h-ybrYo

Can you help me?

Thanks

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