Скорее всего при генерации grpc ты указал не правильный путь
This error typically occurs when protoc-gen-go is not in the shell path, which is different from the Go path. You can test this by typing protoc-gen-go in the terminal, if it says "command not found" (or similar), then it's not in your path. To fix this, you can add the protoc-gen-go binary to your PATH environment variable. If you're still encountering the error after adding protoc-gen-go to your path, you can try using an absolute path instead. Here's an example command that specifies an absolute path: