@uneng Happened with me many times and I think its not big deal. Sometimes we are running multiple applications, multiple browser windows with websites which constantly protected with recaptcha system. It may happen that error is result of slow network or multiple streams running at the same time. Poor connection can also result into Error mark on Recaptcha. All you have to do is refresh the page and redo the process.
I tried hard refresh (ctrl + F5) as well as clicking on the link again.
Matter of fact I tried on a different device as well. As in my mobile as well as my laptop.
Its weird since the issue is only for me. Tried different captchas on different sites and all are working fine except for the WoF.
Strange indeed... have you tried it on mobile data as well?
Try to run java script again from the programs folder. Troubleshoot the browser for JAVA script running.
However its unlikely that one page will respond and another wont.