Error receiving data: Connection reset by peer

The error occurred after I created a form. I have selected create new form, then chose a table, then the datasource then form_Customer page opened with this content
Unable to load page

Problem occurred while loading the URL http://localhost:8080/rfb/angular/index … ocket=true

Error receiving data: Connection reset by peer

How can I solve this? I have tomcat server running in 8080 but I have removed it