Solved! Go to Solution.
@Magendev1 Do one thing enable display errors from index.php if not Or enable error log. Uncomment below line from root index.php
In my error log there is
ERR (3): Notice: Undefined index: MSP_Common in /var/www/vhosts/site.com/httpdocs/app/code/core/Mage/Core/Model/Config.php on line 851
ERR (3): Warning: Invalid argument supplied for foreach() in /var/www/vhosts/site.com/httpdocs/app/code/core/Mage/Core/Model/Config.php on line 870
Sounds to me that you have problems with third part extensions. Apparently an extension tries to access configuration and fails retrieving its data.
@Magendev1 That's the issue. Contact to extension provider for error Or take help of your developer. However if extension not useful then disable it. (System >> Configuration >> Advanced )