Protoc: stdout: . stderr: missing output directives.

The error message “protoc: stdout: . stderr: missing output directives” indicates that there are no output directives specified in the protocol buffer compiler (protoc) command.

In order to use the protoc command, you need to provide directives that specify how the compiler should generate output. These directives define the target language and the files to be compiled.

Here’s an example of a valid protoc command:

protoc --java_out=src/main/java/ my_proto_file.proto

In the above example:

• --java_out=src/main/java/ specifies the output directory for the generated Java code.
• my_proto_file.proto is the input protocol buffer file to be compiled.

You can replace --java_out=src/main/java/ with the appropriate output directive for your target language (e.g., --python_out=generated/ for Python).

Make sure to adjust the paths and filenames according to your project’s structure and requirements.