Accelerator log question.

Could you tell me why the last several lines is "msg":"error reading size preamble".Is there any posible reasons?
And, this Unity Editor Log.


Text:
RemoteAssetCache - Download - Metadata - success:false, namespace:81e94844d19a16919208533e08183531, key:eeda3f7ed8666625e0283334f282d18e
Start importing Assets/xxxx/xxxx(10).png using Guid(e23c6103bbfad6a4eb8cc4b4f898a7c5) Importer(-1,00000000000000000000000000000000)
Done importing asset: 'Assets/xxxx/xxxx(10).png' (target hash: 'b2126ca8f97f743a1c2967fae43341d5') in 0.175468 seconds
RemoteAssetCache::AddArtifactToCacheServer - artifactKey='Guid(e23c6103bbfad6a4eb8cc4b4f898a7c5) Importer(-1,00000000000000000000000000000000)' Target hash='b2126ca8f97f743a1c2967fae43341d5' Key (and library path)='Library/Artifacts/ba/bac23376d065c5030d61099240f29a8e'
RemoteAssetCache - Upload - Artifact - success:true, namespace:81e94844d19a16919208533e08183531, key:bac23376d065c5030d61099240f29a8e
>>>Here Show Upload success, but I use find this record in accelerator server.
>>>This is my search demand:
>>>unity-accelerator.exe cache get 127.0.0.1:80 81e94844d19a16919208533e08183531 bac23376d065c5030d61099240f29a8e

RemoteAssetCache::AddArtifactToCacheServer - artifactKey='Guid(e23c6103bbfad6a4eb8cc4b4f898a7c5) Importer(-1,00000000000000000000000000000000)' Target hash='b2126ca8f97f743a1c2967fae43341d5' Key (and library path)='Library/Artifacts/24/2400bf634c5b70df358bebd475664f55'
RemoteAssetCache - Upload - Artifact - success:true, namespace:81e94844d19a16919208533e08183531, key:2400bf634c5b70df358bebd475664f55
RemoteAssetCache - Download - Metadata - success:false, namespace:81e94844d19a16919208533e08183531, key:15b9977d8f1298ec8e3acdaf8b3b3698
RemoteAssetCache - Upload - Metadata - success:true, namespace:81e94844d19a16919208533e08183531, key:15b9977d8f1298ec8e3acdaf8b3b3698
>>>Only This key is existed!

 

>>>Here Show Upload success, but I didn't find this record in accelerator server.