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Happy new year!

I read in the <https://www.pantsbuild.org/docs/reference-protobuf_sources|docs> that:

&gt; If a codegen target such as `protobuf_sources` will be used in multiple Go modules, then you should use the `parametrize` built-in to parametrize that `protobuf_sources` target for each Go module.
I have a build working with a single Go module, but when I try to parametrize protobuf_sources for a second module:

```protobuf_sources(
    grpc=True,
    go_mod_address=parametrize(
        "src/khronos/service:service", 
        "src/cerberus/service:service",
    ),
    sources=["khronos.proto"],
)```
I get an error:

```InvalidFieldException: Only fields which will be moved to generated targets may be parametrized, so target generator src/khronos/api/v1:v1 (with type protobuf_sources) cannot parametrize the 'go_mod_address' field.```
Can anyone point me in the direction of what I'm doing wrong?

If anyone is curious, I gave up and switched to a single Go module for the entire repository.  But I'm still curious as to why this didn't work!

running into the same error as above.
is
```
    go_mod_address=parametrize(
        "src/khronos/service:service", 
        "src/cerberus/service:service",
    ),```
not the correct usage of the parametrize builtin?