Is it possible to map without encoding with FEC codes prior?

[HomerosTheII]

Hello everyone! I am currently discovering Sionna and was wondering if it was possible to map from binary source to a 16-QAM (or any constellation scheme) without encoding. When I skip encoding LDPC5G (haven't tried any other encoding methods) I get an error.

The error is: InvalidArgumentError: Exception encountered when calling layer 'mapper_5' (type Mapper).

It also states: # Convert the last dimension to an integer

Is there a way to map without encoding?

Thank you for your time everyone

[HomerosTheII]

I realized that I was trying to map to 16 QAM with a binary source that isn't divisible by 4 (my bits per symbol).