Problems programing NI myDaq

[Amochis]

I'm having problems with NI myDaq, it's shows me this error:

Error -50103 occurred at DAQmx Start Task.vi:7220008

Possible reason(s):

The specified resource is reserved. The operation could not be completed as specified.

Task Name: _unnamedTask<4C4>

I want to control a DC Motor.

[Machop]

This happends, because you are tring to create a task that more than one module use, Which hardware are you using? Also it seems that you are using many DAQ assistant, I suggest you to use the LV examples