Sims 3 Not Starting!!

Hi,

I downloaded the Sims 3 and all the expansions and addons from your website. I installed the base game and Supernatural and Seasons expansions.
After that, I followed the instructions at https://games4theworld.forumotion.com/t1171-must-read-how-to-install-the-sims-3-correctly
I am getting an error in the Launcher:

There was an error during startup. Please see the log for more details.

After that, I tried the instructions for the Ultimate Fix in the PDF file given with it.
Again, the same result.
Please help me out!