courtesy In case we’re running an using for the first time, : ASP.NET application on Mono Monodevelop we may receive the below error In some cases, the problem is incorrect of server. installation [xsp4](http://packages.ubuntu.com/precise/web/mono-xsp4) Install it using: sudo apt-get install mono-xsp4 This solved the above error. get it from by searching for Optional: Ubuntu software center xsp4 After the server is installed and ready. The project will start running at xsp4 http://127.0.0.1:8080/ A directory access saying may also show up which can be solved by creating the folder using error [Access to the path “/etc/mono/registry” is denied](http://stackoverflow.com/q/24872394/2404470) simply [mkdir](http://alvinalexander.com/unix/edu/examples/mkdir.shtml) sudo mkdir /etc/mono/registry and setting the right permissions using [chmod](https://en.wikipedia.org/wiki/Chmod) sudo chmod uog+rw /etc/mono/registry Photos Originally published at xameeramir.github.io .