在供应商目录中使用google.golang.org/grpc时出错

I am having issues using google.golang.org/grpc from vendor directory and I get the below error

cannot use &metadata.HeaderMD (type *"google.golang.org/grpc/metadata".MD) as type *"project1/vendor/google.golang.org/grpc/metadata".MD in argument to grpc.Header

I get the error though I am using the necessary version of the package which I copied from my gopath. But, when I delete the golang.google.org/grpc folder from vendor my project fetches the dependency from gopath and it works fine though the one gopath is a copy of when I have in vendor directory and every other library in vendor directory works fine except grpc.