panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0x1d58247] goroutine 7482 [running]: github.com/chrislusf/seaweedfs/weed/command.(*FileCopyWorker).uploadFileInChunks.func1(0x2) /go/src/github.com/chrislusf/seaweedfs/weed/command/filer_copy.go:488 +0x2a7 created by github.com/chrislusf/seaweedfs/weed/command.(*FileCopyWorker).uploadFileInChunks /go/src/github.com/chrislusf/seaweedfs/weed/command/filer_copy.go:455 +0x225 panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0x1d58247] goroutine 7480 [running]: github.com/chrislusf/seaweedfs/weed/command.(*FileCopyWorker).uploadFileInChunks.func1(0x0) /go/src/github.com/chrislusf/seaweedfs/weed/command/filer_copy.go:488 +0x2a7 created by github.com/chrislusf/seaweedfs/weed/command.(*FileCopyWorker).uploadFileInChunks /go/src/github.com/chrislusf/seaweedfs/weed/command/filer_copy.go:455 +0x225