Fatal error: Class name must be a valid object or a string in apiClient.php line 99

[GoogleCodeExporter]

public function __construct($config = array()) {
    global $apiConfig;
    $apiConfig = array_merge((array)$apiConfig, (array)$config);
  99  self::$cache = new $apiConfig['cacheClass']();
  100  self::$auth = new $apiConfig['authClass']();
  101  self::$io = new $apiConfig['ioClass']();
  }

Why is it giving such an error?

Original issue reported on code.google.com by samuel.o...@covenantuniversity.edu.ng on 16 Aug 2012 at 9:26

[GoogleCodeExporter]

I am getting the exact same error, but only on my production server, not on my 
development or staging server. All servers are running the same version of PHP.

Original comment by j...@qccreative.com on 22 Aug 2012 at 12:56

[GoogleCodeExporter]

Also $apiConfig contains NULL and I get a notice on line 98 for attempting to 
array_merge() a null value.

Original comment by j...@qccreative.com on 22 Aug 2012 at 12:58

[GoogleCodeExporter]

Have you made any changes to src/config.php? I was also wondering if you're 
using the latest version of the Google APIs PHP Client on trunk.

Original comment by chirags@google.com on 27 Aug 2012 at 8:56