here's some compile errors

follow the example bookstore, and some error occurs

admindeMacBook-Pro-7:add admin$ pwd
/Users/admin/goProj/bookstore/rpc/add

go 1.15

require (
github.com/golang/protobuf v1.4.3
github.com/tal-tech/go-zero v1.1.4
google.golang.org/grpc v1.36.0
google.golang.org/protobuf v1.25.0
)

admindeMacBook-Pro-7:add admin$ go run .

go.etcd.io/etcd/clientv3/balancer/picker

../../../../go/pkg/mod/go.etcd.io/etcd@v0.0.0-20200402134248-51bdeb39e698/clientv3/balancer/picker/err.go:25:9: cannot use &errPicker literal (type *errPicker) as type Picker in return argument:
*errPicker does not implement Picker (wrong type for Pick method)
have Pick(context.Context, balancer.PickInfo) (balancer.SubConn, func(balancer.DoneInfo), error)
want Pick(balancer.PickInfo) (balancer.PickResult, error)
../../../../go/pkg/mod/go.etcd.io/etcd@v0.0.0-20200402134248-51bdeb39e698/clientv3/balancer/picker/roundrobin_balanced.go:33:9: cannot use &rrBalanced literal (type *rrBalanced) as type Picker in return argument:
*rrBalanced does not implement Picker (wrong type for Pick method)
have Pick(context.Context, balancer.PickInfo) (balancer.SubConn, func(balancer.DoneInfo), error)
want Pick(balancer.PickInfo) (balancer.PickResult, error)

github.com/tal-tech/go-zero/zrpc/internal/balancer/p2c

../../../../go/pkg/mod/github.com/tal-tech/go-zero@v1.1.4/zrpc/internal/balancer/p2c/p2c.go:41:32: not enough arguments in call to base.NewBalancerBuilder
have (string, *p2cPickerBuilder)
want (string, base.PickerBuilder, base.Config)
../../../../go/pkg/mod/github.com/tal-tech/go-zero@v1.1.4/zrpc/internal/balancer/p2c/p2c.go:58:9: cannot use &p2cPicker literal (type *p2cPicker) as type balancer.Picker in return argument:
*p2cPicker does not implement balancer.Picker (wrong type for Pick method)
have Pick(context.Context, balancer.PickInfo) (balancer.SubConn, func(balancer.DoneInfo), error)
want Pick(balancer.PickInfo) (balancer.PickResult, error)

Start by running go run . from bookstore/rpc/add and review the reported version mismatches in the etcd and go-zero balancer files under the Go module cache. Compare the example's go.mod dependencies with the APIs used by those modules; done means the example compiles successfully.