Like Samet said, there isn't enough memory to run your application. However, since you said this happens on starting the application and judging by the stacktrace (it's loading internationalized strings while running out of memory) this is probably due to your project being fairly large. The default setting for memory is only 64 MB so you will probably want to increase this (check https://world.mendix.com/display/refguide4/Configuration)
Your application is out of memory. Some process in your app consumes too much memory. You could investigate why your process is consuming more memory or you can adjust the java heap in your project settings in the server section.