Okgrow/meteor-image-upload package

Hi, I used okgrow/meteor-image-upload this packge to upload category image but it will not displayed, and when i create collection code like this:
Categories = new Mongo.Collection(“categories”);
MyImages = ImageUpload.createCollection(“myImages”, Categories, {
thumbnail: [300, 300],
normal: [800, 400],
superGiant: [4096, 4096]
Then i got error Exited code: 8 and refresh the tab and app not worked.
Please give me solution what should i do to get Image url?