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The EXTRA INVOCATION feat was part of the Complete Arcane supplement which predates Dragon Magic, as a result when it was created it was coded to work on Warlock class, at the time it was the only class with invocations.
I don't see any reason why it would be exclusive to the Warlock. If no one else is working on the Complete Arcane I will try and have this fixed for the next release.
But I will have to find out if anyone else is working on the Complete Arcane first. In the mean time I suggest you just add an additional invocation and ignore the error. Use the Custom feat as a placeholder until then.
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