[Pw_forum] a error from davcio!

[Xiaodong]

Dear everybody
  Sorry for bothering you! Recently, I am running a phonon calculation. There is an error "from davcio". I do not know why.
It is very strange. The job have run for one day very well. But, suddenly, the job dead! If you feel free, could you tell me what happened here? Thank you very much.
The error have been listed:

 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
     task #         4
     from davcio : error #        22
     error while writing to file
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Xiaodong
Hoffmann group, Chemistry and Chemical Biology 
Cornell University, Ithaca, NY, USA.
http://www.chem.cornell.edu/rh34/