This happens if my servers fail to open the inspect link.
You can check if the inspect link is valid by entering it on glws.org.
If the inspect link is valid (checked on glws.org) there has to be some kind of bug on my end.
Sometimes my servers are buggy for a couple of minutes so it helps to retry it again. If it fails repeatedly I'd be very thankful if you could send me the link so I can debug it.
If glws.org fails to display item information, it's very likely that the inspect link is faulty. In that case there is not much I can do. There are two things you can try in that case:
1. Try going to the profile of the skins owner and try to get a different inspect link from their inventory. That almost always works.
2. Click on the tiny csgo item, this should open a small dropdown menu with an inspect link. Use this one if the other one does not work. Screenshots:
Thanks to Sm0res and Gapples for helping me test the workaround.
Navigate to your steam inventory and select the weapon you want to inspect. Right click on the "Inspect in Game" button and copy the link address. Paste the link into the input box and click on "Add". The status should change to "Done" within 10-20 seconds. (It may take longer if there are more items in the queue or my servers fail). If you need further help do not hesitate to contact me :)