你好大佬我按照方法尝试报错了，麻烦有空看下

D:\开发工具\go-code\learn\rpc\proto\pb>protoc --protorpc_out=. arith.proto
WARNING: Package "github.com/golang/protobuf/protoc-gen-go/generator" is deprecated.
A future release of golang/protobuf will delete this package,
which has long been excluded from the compatibility promise.

2020/06/10 09:10:58 template: :12:15: executing "" at <$File.PackageName>: can't evaluate field PackageName in type *generator.FileDescriptor
--protorpc_out: protoc-gen-protorpc: Plugin failed with status code 1.

Start by reproducing `protoc --protorpc_out=. arith.proto` from the reported directory and capture the generator failure at template line 12, where `$File.PackageName` cannot be evaluated. Trace that template and the `generator.FileDescriptor` value used by the plugin; done means the reported proto command completes without the plugin failure.

Written by the indexing model from the issue text.