This constant is defined by the ODBC database extension. If it is not defined, then it means the extension is not installed in your system's PHP.

That being said, in ADOdb this constant is only referenced in the ODBC and ADS drivers, which are not used or supported by MantisBT, so I'm wondering how you could get this error.

A full stack trace may help understanding the problem. Please follow these steps:

1. temporarily configure your system as follows:

   $g_display_errors = array(
   E_WARNING => 'halt',
   E_NOTICE => 'halt',
   E_USER_ERROR => 'halt',
   E_USER_WARNING => 'halt',
   E_USER_NOTICE => 'halt'
   );
   $g_show_detailed_errors = ON;

WARNING - SECURITY RISK: the 'show_detailed_errors' config can cause MantisBT to display sensitive information about your system. We recommend to restrict its activation to a Test environment, only for as long as necessary. If possible, do not turn it ON globally, instead limit it for specific user(s) using the Manage Configuration page.

2. Reproduce the error

If the output does not help you resolving the issue and you need further assistance,

3. save the output of the error screen, preferably as an HTML page (not a screenshot !)
4. be careful to remove/mask any confidential information if needed
5. upload the results here

veenee,

You did not provide any feedback; I am therefore resolving this issue as "no change required".

Feel free to reopen the issue at a later time and provide the requested information.