Computation Error all of a sudden

Hey there, I've got a simple project that's been working fine with a Sure JAB4 board for some time now. I put it aside for a couple of months while I was waiting for some hardware, and when I went back to the project I'm getting unexpected behavior when I try to run it.

I have three readback cells in the project, and as soon as I click on Link, Compile, Connect I see a dialog with the name of the first readback cell, followed by a second dialog with the name of the second readback cell, and in the status bar it just says "Computation Error". There is no dialog for the third readback cell. If I just use the link button it completes with no errors. I'm not sure what has changed since this worked. Is there a way to track down the cause of this error message? Or is there another explanation for it?

Thanks. Project attached.

4705.Zenith 20AT21Z-lin-int.dspproj

software

computation error

4.7 Build 0.1831