DAQ assitant error based on channels used

[octavius88]

on a while loop to produce a ttl signal, the following error came up

Measurements: Write cannot be performed, because the number of channels in the data does not match the number of channels in the task.

When writing, supply data for all channels in the task. Alternatively, modify the task to contain the same number of channels as the data written.

how do i fix this.  previously i had a single numeric value as input but it says i need to fill in all data inputs before it can run.  anyone know how to fix this? thanks

[octavius88]

here is current setup attached

[RavensFan]

What DAQ device are you using?

If you are using digital outputs, why would you be writing a numeric value into the data?  Why aren't you writing a boolean array to the data?

Why do you have the string "3.3" being converted to a U8 array hanging out in space?