(PHP 4 >= 4.0.5, PHP 5 <= 5.0.4)
udm_error -- Get mnoGoSearch error message
Description
string 
udm_error ( resource agent )
    udm_error() returns mnoGoSearch error message, 
    empty string if no error.
   
    agent - link to agent identifier, received 
    after call to udm_alloc_agent().
   
    Receiving agent error message.