after change smf prefix got Table 'smf.smf_prefix1475settin [please help]

[justin_midlet]

this my first time in install forum (its first time to install   )
i use appserv
in installation i read don't use the same smf prefix for other forum

after install complete i change it from setting to smf.smf_prefix1475settings after the page reloaded i got
Table 'smf.smf_prefix1475settings' doesn't exist

how to slove it
i try search but i don't got my wants 

[GigaWatt]

You can't change the prefix after the install, you can only change it before the install. The setting is only there in case you've previously changed the value and you're just upgrading the forum (the database already has a different prefix than "smf_"). If the installer sets the database table prefix, that's it, the prefix is set, the tables in the database are created with that prefix.

Another option is to manually edit the database and change the prefix to... whichever value you want (I would go with ANSI latin avoiding dots, have no idea what symbols are supported by database engines).

If it's a fresh install (new forum), delete everything (files + database), install it again, change the prefix during the install, you should be good to go .

[Sir Osis of Liver]

You can change the table prefix in the database using phpmyadmin.  The prefix must agree with $db_prefix in Settings.php.