Fatal error in upgrade

@pragyan81 There is NOTHING wrong with the configuration used by @ronananjos. This is an error caused by your theme.

You have manually edited the TGMPA library (why?!?) and incorrectly done a search and replace which is causing the problem.
See: https://themes.trac.ww.wp.xz.cn/browser/fotography/2.1.4/inc/fotography-plugin-activation.php#L2114

I suggest you download a fresh copy of TGMPA using the Custom TGMPA Generator, it will serve you with a customized download of TGMPA which will automagically have done the search & replace for you in the correct way.
http://tgmpluginactivation.com/download/

Once you’ve done that, please release a new version of the theme as this is causing problems for more users.

@ronananjos While the theme author gets their act together, here is a simple solution you can use for now:

1. Download the current version of the library from http://tgmpluginactivation.com/download/ (for your purposes, just click on the “Zipball” link below the form)
2. Unzip the file and
3. Copy/upload (via FTP) just the class-tgm-plugin-activation.php file to the ETC/public_html/wp-content/themes/fotography/inc/ directory of your website, replacing the existing fotography-plugin-activation.php file. (mind the name change of the file)

Hope this helps.