Hey there, thanks for the post. We recently split the Bricktronics software drivers into multiple libraries, so there are now multiple libraries you need to install, depending on which NXT/EV3 motors/sensors you want to use. The entire list, and the new software architecture, is explained here in this blog post: http://www.wayneandlayne.com/blog/2015/10/25/bricktronics-software-updates-v1-2/
At the very least you will want to install the BricktronicsShield library: https://github.com/wayneandlayne/BricktronicsShield
Since you're using motors, you'll want to install the BricktronicsMotor library, too: https://github.com/wayneandlayne/BricktronicsMotor
From the errors you posted, I think you might be using one of the original code example sketches, so I would suggest installing the BricktronicsShield and BricktronicsMotor libraries, and checking out the new and improved examples included in the BricktronicsMotor library.
Let us know how it goes!