Smarty Error

[JackRabbit]

I've got an error:

Fatal error: Uncaught --> Smarty: Unable to load template file '__MACOSX/header.tpl' <-- thrown in /home/revtonic/public_html/jackrabbit/whmcs/vendor/whmcs/whmcs-foundation/lib/Terminus.php on line 0

first few lines of code in the terminus.php file:

<?php //00ee8

if(!extension_loaded('ionCube Loader')){$__oc=strtolower(substr(php_uname(),0,3));$__ln='ioncube_loader_'.$__oc.'_'.substr(phpversion(),0,3).(($__oc=='win')?'.dll':'.so');if(function_exists('dl')){@dl($__ln);}if(function_exists('_il_exec')){return _il_exec();}$__ln='/ioncube/'.$__ln;$__oid=$__id=realpath(ini_get('extension_dir'));$__here=dirname(__FILE__);if(strlen($__id)>1&&$__id[1]==':'){$__id=str_replace('\\','/',substr($__id,2));$__here=str_replace('\\','/',substr($__here,2));}$__rd=str_repeat('/..',substr_count($__id,'/')).$__here.'/';$__i=strlen($__rd);while($__i--){if($__rd[$__i]=='/'){$__lp=substr($__rd,0,$__i).$__ln;if(file_exists($__oid.$__lp)){$__ln=$__lp;break;}}}if(function_exists('dl')){@dl($__ln);}}else{die('The file '.__FILE__." is corrupted.\n");}if(function_exists('_il_exec')){return _il_exec();}echo("Site error: the ".(php_sapi_name()=='cli'?'ionCube':'<a href="http://www.ioncube.com">ionCube</a>')." PHP Loader needs to be installed. This is a widely used PHP extension for running ionCube protected PHP code, website security and malware blocking.\n\nPlease visit ".(php_sapi_name()=='cli'?'get-loader.ioncube.com':'<a href="http://get-loader.ioncube.com">get-loader.ioncube.com</a>')." for install assistance.\n\n");exit(199);
?>

This error came up after moving to a new host. How can I troubleshoot this?

[JackRabbit]

Reinstalling the whmcs admin theme file fixed the problem. 

[WHMCS ChrisD]

Glad to hear you got this sorted, it sounds like the theme had a few corrupted files when it was zipped up