You can't inject an expression. You load an expression, or create one, by using an expression preset or twisting the parameter dials. In order to do this you must have the head morphs pack. To create your own expressions you need to inject the morphs first then play around with the dials. If you're trying to INJ an epxression pose from the library it will automatically find the necessary morphs. Question - you did buy the head morph pack from DAZ, didn't you? Otherwise, none of the above will work.

Coppula eam se non posit acceptera jocularum.

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