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Hi,
I'v got an error message when importing data into Spine Essential. The error message is as below:

And it is not working at Spine Essential. The images are all missing.

However, it is working fine in Skeleton Viewer:

The data is not exporting myself, I've got it from somewhere at the internet. Attachment please find the data, please help me to solve the problem.
Thanks in advance.

The error you're seeing is due to the checkbox nonessential data being deselected on export.
As you can read here: Export - Spine User Guide

Nonessential data When checked, additional data is included in the JSON that is not needed to rendering the skeletons. This makes the file slightly larger. This data is needed if the JSON will be imported back into Spine. See Import for more information.

Therefore this explains why you can see the file correctly at runtime.

Sometimes data is imported correctly even though some bits of it are lost, in fact, I tried to import this project, and the problem you're actually having is the fact that you should unpack the images first Texture Packing - Spine User Guide: Texture Unpacker

Then indicate the folder where you unpacked the atlas into single images Images - Spine User Guide: Images node

Then you should be able to see the project in Spine correctly.

Unfortunately, if you're using Spine ESS you won't be able to see PRO features, so the best thing you could do is run the texture unpacker in your Spine, then use the Trial of Spine to load the data and study the project.

Btw where did you get this project from exactly?