Hi, Melisa! 
Congrats on working through your first analysis!
This is an out of memory error:
Out of memory ( OOM ) is an often undesired state of computer operation where no additional memory can be allocated for use by programs or the operating system. Such a system will be unable to load any additional programs, and since many programs may load additional data into memory during execution, these will cease to function correctly. This usually occurs because all available memory, including disk swap space, has been allocated.
If you search the forum for "unable to allocate array" you will find some solutions to this problem, such as this post for example:
Good luck!
Andrew