mlgl error, raster error

[asukachiharu]

• tileserver-gl v4.11.1
• CentOS 7

The source J exists in the data, and the copied tilejson is like: http://localhost:10000/data/J.json.
However, the console outputs an error, so when rendering raster, it shows a 500 error on the console. The docker logs show [ParseError: The document is empty. at offset 0].

mlgl: {
  class: 'Style',
  severity: 'ERROR',
  text: 'Failed to load source J: The document is empty. at offset 0'
}