Mesh Marker in ros3djs - 404 error

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I'm trying to display the PR2 using ros3djs, using 'http://resources.robotwebtools.org/' as the path to resources.. However, I'm getting a bunch of errors from STLLoader.js in the form of:

GET http://resources.robotwebtools.org/pr2_description/meshes/base_v0/caster.stl 404 (Not Found)
Uncaught InvalidStateError: Failed to read the 'responseText' property from 'XMLHttpRequest': The value is only accessible if the object's 'responseType' is '' or 'text' (was 'arraybuffer').

(weirdly enough, the robot is still displayed)

Is there something wrong with my settings, or is the mesh hosting just down? Is there a way to find out?