There's nothing wrong with this code, and it works perfectly fine when I try to run it. Does the IDE highlight any code when the exception is thrown? It may not be this part of the code that is your problem. Maybe post some more of the code so we can try and track it down.

OK, I looked through your source, and the original code you posted looks to be working fine. However, I did find this area of interest within your main sketch:

In your activateMode() function, you call this:
Code:

for(int o = 0; o < 110; o++)
{
...
text(feelings[o], 145 + o * 40, (height/2) - 20);
println(o + " " + feelings[o] + " " + feelingCountDesc[o]); 
... 
 

I may have missed something, but from a glance it seems as if you initialize feelings to "= new String[1];", then you expand() it later to "expand(feelings, feelings.length + 1);". So by my count, the size of feelings is only [2], and yet in the above code, you are incrementing the variable "int o" all the way up to 109, which means you are way out of bounds when trying to call "feelings[o]."  

Again, I looked at the code quickly, so maybe you add 108 items to feelings[] somewhere along the way. But if not, that's what's causing your OB exception.