cannot use c (variable of type *agentClient) as Client value in return statement: *agentClient does not implement Client (missing method GetObjectMeta)

cannot use &singleAgentClient{…} (value of type *singleAgentClient) as interface{"github.com/vdaas/vald/internal/client/v1/client/vald".Client; "github.com/vdaas/vald/apis/grpc/v1/vald".ObjectClient; "github.com/vdaas/vald/apis/grpc/v1/agent/core".AgentClient} value in return statement: *singleAgentClient does not implement interface{"github.com/vdaas/vald/internal/client/v1/client/vald".Client; "github.com/vdaas/vald/apis/grpc/v1/vald".ObjectClient; "github.com/vdaas/vald/apis/grpc/v1/agent/core".AgentClient} (missing method GetObjectMeta)