Plug-in manifest doesn't load its preview image

[dnswodn]

Need help...I provide a correct image name for the plugin manifest, but the preview image doesn't appear, it just keeps loading (maybe?)
Here are my codes, are there anything wrong?

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{
  "id": "$EmergingRoads_JRDCR0",
  "version": 1,
  "title": "EmergingRoads",
  "text": "Created by dnswodn",
  "author": "dnswodn",
  "thumbnail": "EmergingRoadsPreview.png",
  "category": "$cat_road00",
  "url": "",
  "multiplayer": true
}

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[CommanderABab]

Also submit the preview image in the section provided in the submission form.

[dnswodn]

Already provided.It is so strange, I use the same preview image for another plugin manifest, it work, But this one can't. My category file also uses this image, does it cause this?