Database error - /members/membernamehere/

[postcd]

Hello,

my forum works OK, but when i want to view some member profile, it goes to:

/members/membernamehere/

or when i change in vBSEO, turn off rewriting:

/member.php?u=1263

its same "Database error"
XY database has encountered a problem.

503 error (Google Webmaster tools)

please how to debug the cause?

[ozzy47]

When you get a database error, you should get the detailed error sent to the email you entered into your config.php file. That is the error we would need you to post in order for us to help.

[postcd]

Im not getting any email (inbox,spam,all emails) even my public_html/includes/config.php contains

$config['Database']['technicalemail'] = 'myemailhere@gmail.com';

[ozzy47]

What about your server error logs then.

[postcd]

What about your server error logs then.
I have cpanel shared hosting.

cPanel > Latest visitors shows:

/image.php?type=dberror
Error log in cpanel dont show any related error

FTP > error_log shows many lines like this:
Undefined index: forumread in /home/myusername/public_html/vbseo/includes/functions_vbseo_vb.php on line 1246

the "Database error" appears even when vbseo product is Disabled. and even Plugin/Hook System is set to No.

My hosting provider did not found any errors, its a vbulletin error message..