"Internal Error: Timout on utility timer"

I'm not sure what the default value is for time or if you want 0.1 to be the time. I believe the second param should either be 1 or 0, nothing in between. Try setting it all params explicitly, like this:

digitalPulse(C7, 1, 100)

And make sure that 100ms pass before running it again. Here is an example where I'm pulsating the led every 2 seconds, check out line 45.

The official reference lists the format as digitalPulse(pin, state, time), where:

• pin id
  
• state either 1 or 0 (for high or low)
  
• time in miliseconds