Problem with pen and the erasers in the free version of Adobe Animat

hoi!

I have a huion tablet (without screen) for my drawings and my animations.I've download the free version of Animate to test it.I've tried to draw with my pen,but,instead of drawing with the brush(that I've has selected) ,it draws with the eraser.I've tried to re-select he brush(a lot of times),to restart my computers,but it didn't worked.

Now,I'm stuck,and I can't do anything with my pen ,but erase.

Please send help.