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Multi Span roof beam causing error

I have been attempting to calculate a multi-span roof beam.  After opening the module, I add a span to the left and set the length to 9' .  I then attempt to adjust the original span to 5'.   One I enter the length and  select save, the beam image disappears and eventually I receive the attached error.  I have tried entering the 5' length first before adding the left span but I receive the same error.

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