CDO

Hi

I would like to merge and remapping some netcdf file with CDO mergetime and rnn operators. I tried them but I got the following message:

cdo mergetime: Open failed on >pr_EUR-11_CNRM-CERFACS-CNRM-CM5_historical_r1i1p1_CLMcom-CCLM4-8-17_v1_day_19710101-19751231.nc<
Unknown Error

I got same error for the sinfo operator. I use the following CDO version:
beata@beata-HP-Z420-Workstation:~/Documents/NC/EURO-CORDEX/CNRM-CM5-CLM4.8.17/historical_pr$ cdo -V
Climate Data Operators version 1.6.4 (http://code.zmaw.de/projects/cdo)
Compiled: by beata on beata-HP-Z420-Workstation (x86_64-unknown-linux-gnu) Jul 8 2015 10:18:15
Compiler: gcc -std=gnu99 -g -O2 -fopenmp
version: gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2
Features: PTHREADS OpenMP NC4 Z JASPER
Libraries:
Filetypes: srv ext ieg grb grb2 nc nc2 nc4 nc4c
CDI library version : 1.6.4 of Jul 8 2015 10:18:09
CGRIBEX library version : 1.6.4 of Jun 27 2014 14:00:04
GRIB_API library version : 1.10.4
netCDF library version : 4.3.3.1 of Jul 20 2015 08:28:32 $
HDF5 library version : 1.8.11
SERVICE library version : 1.3.2 of Jul 8 2015 10:17:58
EXTRA library version : 1.3.2 of Jul 8 2015 10:17:53
IEG library version : 1.3.2 of Jul 8 2015 10:17:56
FILE library version : 1.8.2 of Jul 8 2015 10:17:54


I checked the files in Matlab and they are correct. The data are stored in rotated grid.
I do not know what the matter is. Can someone help me?

Thank you for your help in advance!