Drag and Drop Question Error

Can some one help with an error when I try to develop a drag and drop question Lectora shuts down every time with a "reference memory" error "The memory could not be read". Any help would be appreciated.Can some one help with an error when I try to develop a drag and drop question Lectora shuts down every time with a "reference memory" error "The memory could not be read". Any help would be appreciated.

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