Discuz Visitor Access Post error resolution

I am a PHP Development learning portal, in the Forum community at the beginning of the initial encounter " visitors to every post are error " problem

Visitors to the content of the specific post is always wrong, Google and Niang have found n times, check the n days, tried all kinds of so-called solutions, do not work, wrong or delay did not solve
Then I went to find the error code, modify the bug, and finally solve.

After the forum was installed, the others are normal, that is, visitors to the post will appear the following error, visitors to the homepage and List page is normal.
After logging in, all is OK.

The error is as follows:

I have found a solution, please see the details:

http://www.phpthinking.com/archives/620

Discuz Visitor Access Post error resolution