* Trac error Internal Server Error !TracError: IOError: zipimport: can not open file /usr/local/lib/python2.6/dist-packages/!TracSubTicketsPlugin-0.1.0-py2.6.egg[[BR]]o Sub[wiki:TracTicket] : 
   * delete python  eggs
   * disable in trac common.ini 
   * restart apache 
 * Update gcc to retrive Joeri's latest version of matrix implementation : 
   * after the mapper_implementation = jpa 
     * error in java.lang.!NoClassDefFoundError: Identifiable	at java.lang.!ClassLoader.defineClass1(Native Method)