Hey NiceJared, <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile">
This may mean you're using a browser that doesn't support WebGL, or has it disabled.
Some browsers have a setting labeled "Use hardware acceleration" or something similar. If this is disabled, WebGL might not work.
An alternative is to export the project as an NW.js desktop application.
A NW.js application takes your game and bundles the WebGL and HTML5 platform stuff in with it.
This way you don't need to rely on a browser for those things, though your file will be bigger as a result.
To try previewing your game with NW.js:
In the "Projects" panel, click the project folder (top-most folder).
Then in the "Properties" panel, in the "Configuration Settings" section, change "Preview browser" to "NW.js".
Now preview your game.
You may need to download NW.js for Construct 2 first from here:
https://www.scirra.com/nwjs