This circuit has no power sources: unable to determine the simulation timestep automatically. Please add a power source or set the simulation timestep under "Interactive Simulation Settings" to proceed.

Hi again.
I built this circuit but I keep getting the error message in the title.  I have gone through the older threads on it but can find nothing to help.  If I run the digital smaples they work fine.  If I run other digital circuits I made they work fine.  I have tried this circuit on another PC and get the same error.
Any help would be greatly appreciated.
Ray
Attachments:
Five input TTL circuit.ms10 ‏81 KB

Followed the procedure I just told you, and it works fine.........again.  I've attached the fixed version, see if it works there now.
Signature: Looking for a footprint, component, model? Might be here > http://ni.kittmaster.com
Attachments:
Five input TTL circuit_fixed.ms10 ‏82 KB

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