Decompressing this format (1) is not supported on this platform

Evaluating v5.5.0f2. Our WebGL release seems to spit this error out all over the place (I assume when downloading assetbundles):

Decompressing this format (1) is not supported on this platform.
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I don't believe that any of our assetbundles are deployed using LZMA but if so, would this be the error that would result?

 

OK. I will try to confirm that that is the issue, thanks.

 

I am now getting this error on downloading an asset bundle in 5.5.1 webgl (bundle built with 5.3.3) - what could be the reason?

In browser log it says: Failed to decompress data for the AssetBundle xxx
which does not really tell me much

 

Yes I see now thanks - it is annoying though as a lot to rebuild and they are now much bigger in size now.
But I suggest making a more descriptive error if possible

 

I'm trying a "quick" WebGL build with 5.6.1 of an older project and I'm getting the same warning. I've tried both uncompressed and chunk based (LZ4), but with the same result. (And always with (1) between brackets as the format.)

The strange part is that it does seem to be able to read some of the asset bundle contents. When I had engine stripping on in the build, it complained about MeshCollider not being a class, because it was only used in the asset bundles and not the main project itself.

Edit: My bad, some of the asset bundles getting retrieved were the wrong ones.