"Mapper not known" Hi - I've previously asked about how to deal with malformed bytes in a stream, and am now trying to use a mapper to see if I can fix the issue. However, I can't seem to get Meltano to recognise the mapper. I've done the following in my project:

meltano add mapper meltano-map-transformer

This adds the mapper OK (if I run it again, it recognises that the mapper already exists) i have added a mapper to my config under "plugins":

mappers:

- name: meltano-map-transformer

pip_url: git+<https://github.com/MeltanoLabs/meltano-map-transform.git>

mappings:

- name: fix_bad_bytes

config:

stream_maps:

customers:

emergency_contact: md5(emergency_contact)

(This just md5's the field for testing) When I try:

meltano run tap-mssql fix_bad_bytes target-snowflake

I get: `Mapper 'meltano-map-transformer' is not known to Meltano. Try running

meltano lock --update --all

to ensure your plugins are up to date.` and running:

meltano lock --update --all

returns:

PS D:\Users\data.analyst\Documents\dev\data_collection_testing\tch_mssql_snowflake> meltano lock --update --all

2025-01-13T10:11:04.738019Z [warning  ] Failed to create symlink to 'meltano.exe': administrator privilege required

Locking 4 plugin(s)...

Locked definition for extractor tap-mssql

Locked definition for loader target-snowflake

Locked definition for mapper meltano-map-transformer

Locked definition for mapper meltano-map-transformer

So it appears all is good, however, on running:

meltano config meltano-map-transformer list

I get:

2025-01-13T10:30:07.481599Z [warning  ] Failed to create symlink to 'meltano.exe': administrator privilege required

`2025-01-13T103007.488828Z [info ] The default environment 'dev' will be ignored for

meltano config

. To configure a specific environment, please use the option

--environment=<environment name>

.` `Mapper 'meltano-map-transformer' is not known to Meltano. Try running

meltano lock --update --all

to ensure your plugins are up to date.` I can't seem to get it to recognise that the mapper is there - I'm guessing I'm missing something straightforward?

I think for some reason your mapper is missing the

variant

field? Try

mappers:
  - name: meltano-map-transformer
    variant: meltano
     ...

Thanks @Edgar Ramírez (Arch.dev) - think you are right that that was causing an issue. I managed to clear everything out to do with mappings, and recreate - and now there is a variant in there. Potentially me mixing up a tutorial script and the cli installation and ended up missing that line.

Awesome! I'll double check the tutorials and getting started guides in case we're missing something there.