Open the file in your browser, and see what it says. It should give you an error message that you can work with.
If you can't get this sorted out yourself then you need to contact your hosting company and ask them for support.
Open the file in your browser, and see what it says. It should give you an error message that you can work with.
If you can't get this sorted out yourself then you need to contact your hosting company and ask them for support.