HTTP 500 Internal Server Error ” , the search engine friendly URL in the Prestashop 1.5.6.1 Activation
You may be faced with a situation where the front end and back office is a blank page, search engine friendly URL is activated. Or, you may see HTTP 500 Internal Server Error . This occurs mainly in the case of the Prestashop 1.5.6.1 ,

To resolve this problem , do the following …

1. Open and close the SEO friendly URL. This will generate a .htaccess file to your root directory
2. Download the .htaccess file . # Forward by the comment line “SETENV HTTP_MOD_REWRITE open ”
3. If you are running on your server PHP version 5.4 , change it to 5.2 . In GoDaddy or Bluehost hosts, you can easily change the version . Just Google the net how to change PHP version for your hosting company .

This should solve your problem . Error “HTTP 500 Internal Server Error ” will be fixed , you will be able to see the front end of the inside pages and back .
If you see “HTTP 500 Internal Server Error” when SEO friendly URLs are activated on Prestashop 1.5.6.1, do the following…

This should solve your problem. Error “HTTP 500 Internal Server Error” will be fixed and you will be able to see the front end, inner pages and back office.

1. On and Off the SEO friendly URLs. This will generate the .htaccess file

2. Comment the line SetEnv HTTP_MOD_REWRITE On by putting # before the line

3. If the version of PHP running on your server is 5.4, change it to 5.2. In godaddy or bluehost hosting, it’s easy to change the version. Just Google on net how to change the version of PHP on your hosting panel.

This should solve your problem. Error “HTTP 500 Internal Server Error” will be fixed and you will be able to see the frontend, inner pages and back office.