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I could be wrong, but from my experience, it stems from the Diminishing Returns on roots. I believe there may be an error in its calculation (I haven't done any direct experiments to prove this) but you're getting the error because the Ent Roots you're trying to place on the target would actually last a shorter amount of time than just letting the current one continue ticking due to DR.
In other words, if the ER you have on the target will last another 6 seconds, but due to DR if you recast ER on the target it'd only last 5 seconds, you get an error because the ER you're trying to cast is "less powerful" than the one currently on it. I'm not entirely convinced the error calculation is correct, but I believe that's where it's coming from.
Any mages or warlocks notice a similar thing with Poly and Fear respectively?
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