尝试访问工作网页时出现Asp.net - 错误

I have created an asp.net webpage and have uploaded it onto a webserver. However when I try to view the page remotely, I get errors about the customerror tag in the web.config file. The page works locally with no errors or warnings. Also if I upload the page as a .html file, I can view it fine remotely. I have seen a lot of other people with this error, but the 'solutions' just say to change the customErrors tag to 'Off', which I have done and does not work, do you know is there an issue with the webserver or what could be the problem here? I have created an asp.net webpage and have uplo