[Ginto8]

In your posted code it's initializing to analog 2, but I assume that's either a typo or you put it in place for a test. If it says that analog 1 is already allocated, you must have another AnalogChannel in your code using that same port. It doesn't seem to be in your posted code, so you'll have to go through the rest of your code to check. Keep in mind that certain other things, like Gyros, also use AnalogChannels internally.