Call to an undefined method with personaliced builder phpstan

I´m working with laravel and i have installed larastan and when execute this library, return me this message:

Call to an undefined method
         AppBuildersLiquidBuilder::conTipoGrupo().

This method it´s in my personaliced builder and his body it´s:

public function conTipoGrupo(): self
    {
        return $this->leftJoin
...

i´m calling this method in other function and i´m building a query

$regs = GrupoLiquidaciones::conAplicaciones()
            ->conTipoGrupo()

In my model i´m instancing to my builder and i have my phpDoc because it´s personaliced builder:

/**
     * @param Builder $query
     * @return BuilderGrupoLiquidaciones
     * 
     * Devuelve una instancia del Builder de grupos de liquidacion
     */
    public function newEloquentBuilder($query): LiquidBuilder
    {
        return new BuilderGrupoLiquidaciones($query, $this->table);
    }

i don´t know that i should to do to solve this message. Thanks for readme and sorry for my bad english