This is probably going to be the strangest explanation and possible solution that I have ever done.
First, I did try your circuit and recieved the error message. The reason I dd not get this yesterday was because I was only using 1/2 of it and not the other half in conjunction with the first half.
What I did first was to replace the second half of the component and have it use a diferent Reference Designator like U3A. This made the circuit work with no error messages displayed. This did not make sense that you could only use one half a a dual component and get error messages when using both of them contained in one reference designator i.e. U2a U2b. So I suspected a problem of some fashion with the Master Database where this part is concerned so I decided to try and isolate what may be causing this. I copied the component to my User database so I could edit it if necessary. I looked at my newly transferred component and it said it was a single component with 8 pins. I edited this to make it a dual component with 14 pins.
To make a long story short, I replaced the one in your schematic with the one I created in my database and now everything seems to work and no error messages. The only thing I can figure is that there may have been a template error for this component in the master database and by me putting it in the user database it refreshed and corrected the template, I am just guessing on this last part as I do not really know why the new one works and the Master Database one doesn't.
I am going to include 2 files for you. The first is a .PRZ file for the component. This will automatically place it in your user database. Just open it like any other Multisim file. The next is your schematic with this part in it. Let me know if this works or not on your end.
