Geoanalytices Server of ArcGIS 10.5 prerelease
when I register Big Data File Share,I offen have the problem:"An error has occurred while generating the big data file share manifest"

and the logs write:
| Error executing tool. GenerateManifest Job ID: jd1493492bc3e4340aeb383990daa2757 : {"messageCode":"BD_101030","message":"Failed to execute GenerateManifest. Please contact your administrator with job ID 'jd1493492bc3e4340aeb383990daa2757'.","params":{"toolName":"GenerateManifest","jobID":"jd1493492bc3e4340aeb383990daa2757"}} Failed to execute (GenerateManifest). | System/GeoAnalyticsTools.GPServer |
| Failed to execute GenerateManifest. Please contact your administrator with job ID 'jd1493492bc3e4340aeb383990daa2757'. | System/GeoAnalyticsTools.GPServer |

when It appeared some times unfederated Server and federated it again may be back to normal but most of time It doesn't work .So I have to unfederated Server and reinstall portal . So what's the problem of Geoanalytices Server of ArcGIS 10.5 prerelease??
the reinstall nearly make me crazy!!!