I'm getting an error message in the Mac Terminal when I try to run several different processes. I did some googling and looking on this site, and found out that it might be related to having too many processes running at one time. However, I'm getting these error messages when I only have a few windows open (much fewer than I was accustomed to having). Looking in activity Monitor, my %User number is at around 25%, and the %System number is around 15%. In the past, I have had both much much higher (until the people at the Apple store told me to keep an eye on it). So with these numbers lower now, what explains the Resource temporarily unavailable error message?

heroku (cloud hosting) console

-bash: fork: Resource temporarily unavailable -bash-3.2$ 

upon opening new window in the terminal

sh: fork: Resource temporarily unavailable
sh: fork: Resource temporarily unavailable

trying to run

-bash: fork: Resource temporarily unavailable