how to fill data with RelationManager Associate

i have 2 models: Group and Unit.

Group.php
public function units(): HasMany
{
return $this->hasMany(Unit::class);
}

Unit.php
public function group(): BelongsTo
{
return $this->belongsTo(Group::class);
}

i created an UnitsRelationManager in GroupRessource and registered it getRalations.

and i have this in my table function
->headerActions([
Tables\Actions\AssociateAction::make()->preloadRecordSelect(),
])

i'm getting this error when i try to associate a record
Capture_decran_du_2023-10-19_19-33-38.png
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