hi there Nicolas,
there is only one line in my model.php file that looks like that one you referred to in the other post about tienda.
That's interesting.
We need a bit more information as we can't reproduce the problem on our end.
Could you edit the file libraries/joomla/application/component/model.php near line 122. You should have that:
JError::raiseWarning( 0, 'Model class ' . $modelClass . ' not found in file.' );
Could you replace it by:
JError::raiseWarning( 0, 'Model class ' . $modelClass . ' not found in file '. $path );
Then, try again and copy/paste us the new error message. That will allow us to better understand the problem.
mine is:
JError::raiseWarning(0, JText::sprintf('JLIB_APPLICATION_ERROR_MODELCLASS_NOT_FOUND', $modelClass ));
is the above the one I should edit?