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This can be one of two things:

The character you are trying to resurrect is too high-level and the mana cost is beyond your range. This is likely for a non-specialist trying to rez a tank, as cost depends on the target character's hit points. A resurrect scroll always works (no mana requirement) so keep a spare or two around.

You need to drink a potion! If the character just cast a significantly mana-draining spell (e.g rezzing someone else!), there may not be enough left for the rez attempt.