[dev] dimp doesn't load

[Duck]

I tried dimp but it dosen't load for me.
Here are the JS Error show up by firebug.

DimpVar is not defined
[Break on this error] showPreview: DimpVar.preview_pref,
DimpCore.js (line 18)

DimpCore has no properties
[Break on this error] var fid = DimpCore.getFolderId(mbox);
DimpCore.js (line 1249)