The message seems to be coherent with the image you attached.
I am seeing all the Faces turned to the camera view.
So, to be able to bridge then you need to select faces that are pointing to each other - at least almost. You also can apply this command to each pair of faces - you cannot select the four faces as it seems to be in your image.
Did this help you to find what is wrong?
I'm away from my PC, so I can't illustrate it now.
Let's try this way...
Looking from the bottom the faces you should make one are these shown bellow:
Now, to help you to understand where is the selection compared to your image notice the coloured table legs only the inner faces for bridge are selected:
In your image both selections are facing the camera view.
