Problems declaring global QIcons

[SkripT]

Hi all, my application crashes when I make the following declarations of icons in the global space:

static const QIcon IconeInicialFotoPetita("../icone.bmp");
static const QIcon IconeLlibreObert("../llibreobert.png");
static const QIcon IconeLlibreTancat("../llibretancat.png");
static const QIcon IconeCarpetaOberta("../carpetaoberta.png");
static const QIcon IconeCarpetaTancada("../carpetatancada.png");

static const QIcon IconeInicialFotoPetita("../icone.bmp");
static const QIcon IconeLlibreObert("../llibreobert.png");
static const QIcon IconeLlibreTancat("../llibretancat.png");
static const QIcon IconeCarpetaOberta("../carpetaoberta.png");
static const QIcon IconeCarpetaTancada("../carpetatancada.png");

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But it doesn't crash if I just declare them as null icons:

static const QIcon IconeInicialFotoPetita;
static const QIcon IconeLlibreObert;
static const QIcon IconeLlibreTancat;
static const QIcon IconeCarpetaOberta;
static const QIcon IconeCarpetaTancada;

static const QIcon IconeInicialFotoPetita;
static const QIcon IconeLlibreObert;
static const QIcon IconeLlibreTancat;
static const QIcon IconeCarpetaOberta;
static const QIcon IconeCarpetaTancada;

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Anybody could explain me why?

Thanks.