Edit: I found a way to solve this that worked for me, so I'm going to post my new information above my previous post.
New information: After hitting the 141 error my screen stuck and I was unable to proceed forward with installation. None of the menu options worked and the only way I was able to restart the elementary installation was by pressing and holding (may 5-10 seconds) the power button.
Then rEFInd booted back up, I selected the thumb drive again and started the install from scratch using instructions from an It's F.O.S.S. guide by Abhishek Prakash (this is for Luna but worked for Freya too): http://itsfoss.com/guide-install-elementary-os-luna/
Previous post: I experienced this issue too installing on an old MacBook Air on a USB drive after setting up rEFInd with OS X El Capitan and partitioning the hard drive in half but leaving it blank prior to booting up Freya.
I am specifically at the Installation type stage of installation. When I click the various options (Quit, Continue anyway, Try again) there is no response and the window appears stuck.
Did you ever figure this out, OP?