mock-server is not running with proto file containing service name as string plus number followed by small letter

[RashmiNarayan]

Proto file snippet:-

syntax = "proto3";
package service.dtype1systems;
option go_package = "test/sample";

service Dtype1systems {
rpc Method1(exampleRequest) returns(response);
}
docker run -p 4770:4770 -p 4771:4771 -v /home/usr/mock-servers/protos:/proto -v /home/usr/mock-servers/stubs:/stub tkpd/gripmock --imports="/protobuf,/proto" --stub=/stub /proto/example.proto

/go/src/grpc/server.go:67:2: undefined: sample.Dtype1systems
2022/12/20 07:57:47 exit status 2

but when i am changing the service name to Dtype1Systems . Mock-server is working fine.