[Koha] Label Plugin (ByWater) - How to print a marc subfield?

[Alipio Luiz de Souza Silva]

I'm trying to configure a template on Label Plugin.
I need to print a marc subfield, but it's not working..

When I try to use the following code
[% item.marc.subfield('090','a') %]

I receive the message below:
Template process failed: undef error - Undefined subroutine
&C4::Biblio::GetMarcBiblio called at
/var/lib/koha/library/plugins/Koha/Plugin/Com/ByWaterSolutions/LabelMaker.pm
line 438.

How to solve that? Can you help me?

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28/11/23,
09:13:23