[SOLVED][Drupal Errors] Fatal error: Call to undefined function
Many Drupal users have encountered a "Fatal error: Call to undefined function" error message in their Drupal site. If you are faced with an error of a similar type in your Drupal site then read on to find out more about the issue.
The error is most often caused by version problems associated with contributed modules or themes. It is likely that you have installed the wrong version of the module or that a compatible version of the module does not exist. Turning on the legacy.module in your Drupal site will solve some of the problems by enabling older functions that the module in question is trying to access. Otherwise you need to turn to the module maintainer to resolve the issue.
Hope that helps.
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Reference: http://drupal.org/node/128878
