MediaWiki server mirgation

After moving a mediawiki wiki from a shared host to VPS some of the extensions don't seem to be working.

Do I need to change anything (possibly the $IP in LocalSetting.php)?

Currently it is this:
if( defined( 'MW_INSTALL_PATH' ) ) {
} else {
    $IP = dirname( __FILE__ );

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Any ideas much appreciated.
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You don't need to change any thing here further you can refer
jns_johnsonAuthor Commented:
Thanks for your comment shalabhsharma, I actually followed that guide when doing the migration.

I think different server types require slightly different configuration so this hasn't helped me unfortunately.

I am going to close this question and seek help elsewhere.

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jns_johnsonAuthor Commented:
Closing the questions as no one seems to be able to help.
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