Dear all,
I try to run RegCM5 CMIP6 data but I get this error:

NetCDF: Unknown file format                                                     
 mod_cmip6_mpihr.F90 :      383:Error opening file https://esgf3.dkrz.de/thredds/dodsC/cmip6/CMIP/MPI-M/MPI-ESM1-2-HR/historical/r1i1p1f1/Oday/tos/gn/v20190710/tos_Oday_MPI-ESM1-2-HR_historical_r1i1p1f1_gn_20100101-20141231.nc.:          -51
STOP  Execution terminated because of runtime error

how can I get the data?

Thank you in advance.
Best regrds,
zeinab