diff --git a/client/internal/ticktock/shardstore_gc.go b/client/internal/ticktock/shardstore_gc.go
index 9cad74e..8dafb6b 100644
--- a/client/internal/ticktock/shardstore_gc.go
+++ b/client/internal/ticktock/shardstore_gc.go
@@ -98,12 +98,12 @@ func (j *ShardStoreGC) gcOne(t *TickTock, space *types.UserSpaceDetail) error {
 	ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(time.Minute))
 	defer cancel()
 
-	_, err = agtCli.CacheGC(ctx, &hubrpc.CacheGC{
+	_, cerr := agtCli.CacheGC(ctx, &hubrpc.CacheGC{
 		UserSpace:  *space,
 		Availables: allFileHashes,
 	})
-	if err != nil {
-		return fmt.Errorf("request to cache gc: %w", err)
+	if cerr != nil {
+		return fmt.Errorf("request to cache gc: %w", cerr)
 	}
 	return nil
 }
diff --git a/client/internal/uploader/user_space_upload.go b/client/internal/uploader/user_space_upload.go
index da3d1b3..9223aa4 100644
--- a/client/internal/uploader/user_space_upload.go
+++ b/client/internal/uploader/user_space_upload.go
@@ -109,13 +109,13 @@ func (u *Uploader) UserSpaceUpload(userSpaceID clitypes.UserSpaceID, rootPath st
 	srcHubCli := stgglb.HubRPCPool.Get(stgglb.SelectGRPCAddress(*srcSpace.MasterHub, *addr))
 	defer srcHubCli.Release()
 
-	listAllResp, err := srcHubCli.PublicStoreListAll(context.Background(), &hubrpc.PublicStoreListAll{
+	listAllResp, cerr := srcHubCli.PublicStoreListAll(context.Background(), &hubrpc.PublicStoreListAll{
 		UserSpace: *srcSpace,
 		Path:      rootPath,
 	})
-	if err != nil {
+	if cerr != nil {
 		delPkg()
-		return nil, fmt.Errorf("listing public store: %w", err)
+		return nil, fmt.Errorf("listing public store: %w", cerr)
 	}
 
 	adds, err := u.uploadFromPublicStore(srcSpace, &targetSapce.Space, listAllResp.Entries, rootPath)
diff --git a/common/pkgs/ioswitch2/hub_worker.go b/common/pkgs/ioswitch2/hub_worker.go
index 7aa4b21..a6f2c97 100644
--- a/common/pkgs/ioswitch2/hub_worker.go
+++ b/common/pkgs/ioswitch2/hub_worker.go
@@ -48,7 +48,7 @@ type HubWorkerClient struct {
 
 func (c *HubWorkerClient) ExecutePlan(ctx context.Context, plan exec.Plan) error {
 	_, err := c.cli.ExecuteIOPlan(ctx, &hubrpc.ExecuteIOPlan{Plan: plan})
-	return err
+	return err.ToError()
 }
 func (c *HubWorkerClient) SendStream(ctx context.Context, planID exec.PlanID, id exec.VarID, stream io.ReadCloser) error {
 	_, err := c.cli.SendIOStream(ctx, &hubrpc.SendIOStream{
@@ -60,20 +60,20 @@ func (c *HubWorkerClient) SendStream(ctx context.Context, planID exec.PlanID, id
 			}
 		}),
 	})
-	return err
+	return err.ToError()
 }
 func (c *HubWorkerClient) SendVar(ctx context.Context, planID exec.PlanID, id exec.VarID, value exec.VarValue) error {
 	_, err := c.cli.SendIOVar(ctx, &hubrpc.SendIOVar{
 		PlanID: planID, VarID: id, Value: value,
 	})
-	return err
+	return err.ToError()
 }
 func (c *HubWorkerClient) GetStream(ctx context.Context, planID exec.PlanID, streamID exec.VarID, signalID exec.VarID, signal exec.VarValue) (io.ReadCloser, error) {
 	resp, err := c.cli.GetIOStream(ctx, &hubrpc.GetIOStream{
 		PlanID: planID, VarID: streamID, SignalID: signalID, Signal: signal,
 	})
 	if err != nil {
-		return nil, err
+		return nil, err.ToError()
 	}
 
 	return io2.CounterCloser(resp.Stream, func(cnt int64, err error) {
@@ -87,7 +87,7 @@ func (c *HubWorkerClient) GetVar(ctx context.Context, planID exec.PlanID, varID
 		PlanID: planID, VarID: varID, SignalID: signalID, Signal: signal,
 	})
 	if err != nil {
-		return nil, err
+		return nil, err.ToError()
 	}
 	return resp.Value, nil
 }
diff --git a/common/pkgs/ioswitchlrc/hub_worker.go b/common/pkgs/ioswitchlrc/hub_worker.go
index 28ecddd..63a7c98 100644
--- a/common/pkgs/ioswitchlrc/hub_worker.go
+++ b/common/pkgs/ioswitchlrc/hub_worker.go
@@ -43,7 +43,7 @@ type HubWorkerClient struct {
 
 func (c *HubWorkerClient) ExecutePlan(ctx context.Context, plan exec.Plan) error {
 	_, err := c.cli.ExecuteIOPlan(ctx, &hubrpc.ExecuteIOPlan{Plan: plan})
-	return err
+	return err.ToError()
 }
 func (c *HubWorkerClient) SendStream(ctx context.Context, planID exec.PlanID, id exec.VarID, stream io.ReadCloser) error {
 	_, err := c.cli.SendIOStream(ctx, &hubrpc.SendIOStream{
@@ -51,20 +51,20 @@ func (c *HubWorkerClient) SendStream(ctx context.Context, planID exec.PlanID, id
 		VarID:  id,
 		Stream: stream,
 	})
-	return err
+	return err.ToError()
 }
 func (c *HubWorkerClient) SendVar(ctx context.Context, planID exec.PlanID, id exec.VarID, value exec.VarValue) error {
 	_, err := c.cli.SendIOVar(ctx, &hubrpc.SendIOVar{
 		PlanID: planID, VarID: id, Value: value,
 	})
-	return err
+	return err.ToError()
 }
 func (c *HubWorkerClient) GetStream(ctx context.Context, planID exec.PlanID, streamID exec.VarID, signalID exec.VarID, signal exec.VarValue) (io.ReadCloser, error) {
 	resp, err := c.cli.GetIOStream(ctx, &hubrpc.GetIOStream{
 		PlanID: planID, VarID: streamID, SignalID: signalID, Signal: signal,
 	})
 	if err != nil {
-		return nil, err
+		return nil, err.ToError()
 	}
 
 	return resp.Stream, nil
@@ -74,7 +74,7 @@ func (c *HubWorkerClient) GetVar(ctx context.Context, planID exec.PlanID, varID
 		PlanID: planID, VarID: varID, SignalID: signalID, Signal: signal,
 	})
 	if err != nil {
-		return nil, err
+		return nil, err.ToError()
 	}
 	return resp.Value, nil
 }
diff --git a/common/pkgs/rpc/hub/pool.go b/common/pkgs/rpc/hub/pool.go
index d6c1c9b..71875f1 100644
--- a/common/pkgs/rpc/hub/pool.go
+++ b/common/pkgs/rpc/hub/pool.go
@@ -66,6 +66,7 @@ func (p *Pool) Get(ip string, port int) *Client {
 	return &Client{
 		addr: ga,
 		con:  con.grpcCon,
+		cli:  NewHubClient(con.grpcCon),
 		pool: p,
 	}
 }
diff --git a/common/pkgs/rpc/hub/server.go b/common/pkgs/rpc/hub/server.go
index d7f5c25..549e692 100644
--- a/common/pkgs/rpc/hub/server.go
+++ b/common/pkgs/rpc/hub/server.go
@@ -18,9 +18,11 @@ type Server struct {
 }
 
 func NewServer(cfg rpc.Config, impl HubAPI) *Server {
-	return &Server{
-		ServerBase: rpc.NewServerBase(cfg, impl, &Hub_ServiceDesc),
+	svr := &Server{
+		svrImpl: impl,
 	}
+	svr.ServerBase = rpc.NewServerBase(cfg, svr, &Hub_ServiceDesc)
+	return svr
 }
 
 var _ HubServer = (*Server)(nil)
diff --git a/common/pkgs/rpc/utils.go b/common/pkgs/rpc/utils.go
index 562b1bd..98a0f1b 100644
--- a/common/pkgs/rpc/utils.go
+++ b/common/pkgs/rpc/utils.go
@@ -245,8 +245,20 @@ func Failed(errCode string, format string, args ...any) *CodeError {
 	}
 }
 
-func (c *CodeError) Error() string {
-	return fmt.Sprintf("code: %s, message: %s", c.Code, c.Message)
+// 定义一个额外的结构体，防止陷入 (*CodeError)(nil) != nil 的陷阱
+type ErrorCodeError struct {
+	CE *CodeError
+}
+
+func (c *ErrorCodeError) Error() string {
+	return fmt.Sprintf("code: %s, message: %s", c.CE.Code, c.CE.Message)
+}
+
+func (c *CodeError) ToError() error {
+	if c == nil {
+		return nil
+	}
+	return &ErrorCodeError{CE: c}
 }
 
 func getCodeError(err error) *CodeError {
diff --git a/coordinator/internal/cmd/serve.go b/coordinator/internal/cmd/serve.go
index 0a20081..e03aa22 100644
--- a/coordinator/internal/cmd/serve.go
+++ b/coordinator/internal/cmd/serve.go
@@ -9,6 +9,7 @@ import (
 	"gitlink.org.cn/cloudream/common/pkgs/mq"
 	stgglb "gitlink.org.cn/cloudream/jcs-pub/common/globals"
 	coormq "gitlink.org.cn/cloudream/jcs-pub/common/pkgs/mq/coordinator"
+	hubrpc "gitlink.org.cn/cloudream/jcs-pub/common/pkgs/rpc/hub"
 	"gitlink.org.cn/cloudream/jcs-pub/coordinator/internal/config"
 	"gitlink.org.cn/cloudream/jcs-pub/coordinator/internal/db"
 	mymq "gitlink.org.cn/cloudream/jcs-pub/coordinator/internal/mq"
@@ -44,6 +45,7 @@ func serve(configPath string) {
 	}
 
 	stgglb.InitMQPool(config.Cfg().RabbitMQ)
+	stgglb.InitHubRPCPool(hubrpc.PoolConfig{})
 
 	db2, err := db.NewDB(&config.Cfg().DB)
 	if err != nil {