Run anti-robot test problem

I have been trying to use this tool for my literature survey. But every time I run this, I get the following problem. At first, it worked but now it returns the following error and it does not complete the search:

Please enter 1 after completing the anti-robot test at https://scholar.google.com/scholar?hl=en&as_sdt=0%2C6&q=test&btnG=