I followed all the steps in the intro of the pset7 spec (up until the xkcd sandwich joke) but cs50 finance loads a blank page in appliance's Chrome browser when I enter the pset7 URL. The element inspector of the page returned states a "500 server error" for "status code". What is going wrong and how can I fix it?

  • Have you gone through the chmod steps a second time and confirmed all files are permissioned appropriately? That's a common problem. Perhaps give it another whirl and let us know if you still encounter the error
    – lethaljd
    Jan 12, 2015 at 12:52
  • Thank for the response. I went through all steps again and also deleted all pset7 files to start over fresh. I went through chmod calls: chmod a+x ~ chmod a+x ~/vhosts chmod a+x ~/vhosts/pset7 chmod a+x ~/vhosts/pset7/public (within the "public" folder): chmod a+x css fonts img js chmod a+r css/* fonts/* img/* js/* and also wrote this into "hosts" window after sudo gedit: pset7 Still receive same blank page on chrome.
    – Daniel
    Jan 12, 2015 at 21:26
  • I am having the exact same problem!
    – user4642
    Jan 12, 2015 at 22:13
  • Having checked all the privileges with ls -l and ls -ld, reinstalled the files to start afresh and restarted the appliance several times I too still get the blank page with 500 server error in the status code. I have been able to download and set the permissions of pset8 to successfully display the page required at pset8 so I feel there could be an issue here. As with the others, any help much appreciated! Jan 14, 2015 at 12:25
  • I'm having the same problem, too! I went through all steps again, but it didn't help at all, I am still just getting a blank page.
    – user4666
    Jan 14, 2015 at 17:27

1 Answer 1


The Apache2 web server in the current version of the appliance needs a configuration tweak. Please run the following commands in a terminal in your appliance:

sudo a2dismod php5
sudo a2enmod suphp
sudo service apache2 restart

Then try again to visit http://pset7/ in Chrome in the appliance.

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