Cannot generate desecrated mod

I cannot reveal desecrated modifier on this item:

Item Class: Staves
Rarity: Rare
Blight Spire
Gelid Staff
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Requires: Level 3, 9 Int
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Item Level: 4
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Grants Skill: Level 2 Freezing Shards
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27% increased Spell Damage
+45 to maximum Mana
+2 to Level of all Cold Spell Skills
+8 to Intelligence
Gain 2 Mana per Enemy Killed
Desecrated Prefix


I get:
Crafting failed: Could not generate Mod.