Error 201025 whne running through CVI, though NI MAX works fine

I created a task in MAX with an Analog Output task. I configured the channel with min/max voltage +-1.5V, sample count 1k and rate 10k, continuous output and triangle function. This works fine.

However, when I use DAQmxLoadTask and then DAQmxStartTask in CVI I get a 201025 error.

I verfied that the task has been loaded and CVI recognizes the channel by reading the channel parameters and printing them on screen.

Device is USB 6229.