DK Frost Strike unknown

I was wondering why my character doesn't cast the "Frost Strike". By analysis of the log, I coul read :

[Debug] 02:19 - Spell(string spellName): spellName=Conversion, Id found: 119975, Name found: Conversion, NameInGame found: Conversion, know = True

[Debug] 02:19 - Spell(string spellName): spellName=Death Grip, Id found: 49576, Name found: Death Grip, NameInGame found: Death Grip, know = True

[Debug] 02:19 - Spell(string spellName): spellName=Strangulate, Id found: 47476, Name found: Strangulate, NameInGame found: Strangulate, know = True

[Debug] 02:19 - Spell(string spellName): spellName=Mind Freeze, Id found: 47528, Name found: Mind Freeze, NameInGame found: Mind Freeze, know = True

[Debug] 02:19 - Spell(string spellName): spellName=Outbreak, Id found: 77575, Name found: Outbreak, NameInGame found: Outbreak, know = True

[Debug] 02:19 - Spell(string spellName): spellName=Horn of Winter, Id found: 57330, Name found: Horn of Winter, NameInGame found: Horn of Winter, know = True

[Debug] 02:19 - Spell(string spellName): spellName=Pillar of Frost, Id found: 51271, Name found: Pillar of Frost, NameInGame found: Pillar of Frost, know = True

[Debug] 02:19 - Spell(string spellName): spellName=Icebound Fortitude, Id found: 48792, Name found: Icebound Fortitude, NameInGame found: Icebound Fortitude, know = True

[Debug] 02:19 - Spell(string spellName): spellName=Anti-Magic Shell, Id found: 48707, Name found: Anti-Magic Shell, NameInGame found: Anti-Magic Shell, know = True

[Debug] 02:19 - Spell(string spellName): spellName=Howling Blast, Id found: 49184, Name found: Howling Blast, NameInGame found: Howling Blast, know = True

[Debug] 02:19 - Spell(string spellName): spellName=Howling Blast, Id found: 49184, Name found: Howling Blast, NameInGame found: Howling Blast, know = True

[Debug] 02:19 - Spell(string spellName): spellName=Plague Strike, Id found: 45462, Name found: Plague Strike, NameInGame found: Plague Strike, know = True

[Debug] 02:19 - Spell(string spellName): spellName=Obliterate, Id found: 49020, Name found: Obliterate, NameInGame found: Obliterate, know = True

[Debug] 02:19 - Spell(string spellName): spellName=Howling Blast, Id found: 49184, Name found: Howling Blast, NameInGame found: Howling Blast, know = True

[Debug] 02:19 - Spell(string spellName): spellName=Frost Strike => Failed

[Debug] 02:19 - Spell(string spellName): spellName=Empower Rune Weapon, Id found: 47568, Name found: Empower Rune Weapon, NameInGame found: Empower Rune Weapon, know = True

The loading of the spell seems fail and won't cast it in game.

[Fight] 02:21 - Cast Outbreak (Outbreak)

[Fight] 02:21 - Cast Howling Blast (Howling Blast)

[Fight] 02:21 - Cast Horn of Winter (Horn of Winter)

[Fight] 02:21 - Cast Horn of Winter (Horn of Winter)

[Fight] 02:21 - Cast Horn of Winter (Horn of Winter)

[Fight] 02:21 - Cast Pillar of Frost (Pillar of Frost)

[Fight] 02:21 - Cast Obliterate (Obliterate)

[Fight] 02:21 - Cast Obliterate (Obliterate)

[Fight] 02:21 - Cast Mind Freeze (Mind Freeze)

[Fight] 02:21 - Cast Howling Blast (Howling Blast)

[Fight] 02:21 - Cast Obliterate (Obliterate)

The Fight Class : FrostDK.xml