The first time you launch Titanfall, the game will attempt to launch at a screen resolution of 1280x720. If your monitor does not support this resolution, the game will fail to launch and present you with this error message. To correct this, go to:
Open up videoconfig.txt with Microsoft Notepad.
Change the following lines to a supported screen resolution. For example if your PC monitor supports 1080p, you would edit the file with the following values: