[SOLVED] Failed to decompress data for an AssetBundle in StreamingAssets

We are building the asset bundles for our WebGL application using extension .assetbundle .
We are running our app on IIS server.
We define MIME type .assetbundle as "application/octet-stream".

Everything worked when I kept all asset bundles outside the project.
Now I want to put a default asset bundle in StreamingAssets folder to make sure it is always available and asset will be displayed if external asset bundle load fails.

I am getting error "Error while downloading Asset Bundle: Failed to decompress data for the AssetBundle 'http://localhost/[application_path]/StreamingAssets/def_model.assetbundle'."

I tried to build the asset bundle with LZ4 and "No Compression" but result is the same.

So, the same bundle read fine from the outside of the build but fails to decompress data when inside the build (in StreamingAssets folder).

What am I missing?

 

No errors on local Build&Run.

Note: No 404 error before the message which means that file is found.

 

I solved it. It was my error not to publish StreamingAssets folder next to the Build folder on a server.
Everything works!