Hi,
The two channel scope vi is not working because you have already set the driver to use NI-DAQmx. This VI is written with Traditional DAQ, and therefore you can't use it unless you reset the driver to Traditional DAQ. To remedy this, you will need to reset the driver in MAX under Traditional NI-DAQ Devices. Right click on Traditional DAQ devices, and select reset driver. Once you do that, you should be able to run the VI.
So, I would suggest moving over to DAQmx for your counter application. There are examples in the example finder in the Hardware Input and Output>>DAQmx>>Counter Measurements folder that you could use to start with.
Remember to reset the driver when switching between Traditional and DAQmx. You will use the same steps for switching between either one. That is, if you have been using Traditional and you want to start using DAQmx, then reset the driver in the Traditional DAQ devices menu.
I hope this helps. Have a Great Day!
George