I get this error, when using BibManager Tags. Googled and Qwanted a lot, but could not find the reason. Some hint would be appreciated.
Here is the complete error trace:
[ea044aa8cdd04b374f0044c2] /index.php/Extension:BibManager_Test Error: Class 'XML' not found
#0 /var/www/html/includes/parser/Parser.php(3979): BibManagerHooks::onBiblistTag(NULL, array, Parser, PPFrame_Hash)
#1 /var/www/html/includes/parser/PPFrame_Hash.php(353): Parser->extensionSubstitution(array, PPFrame_Hash)