cdo sub (Abort): infile2 cannot be a pipe in fill mode!

Hi all,
I am trying to find anomalies of hourly data for 20 years by subtracting dailymean from each timestep of the same day.
The command I am using is written below:
cdo sub infile1 -daymean infile1 outfile

The error I am getting is:

@cdo(1) daymean: Process started
cdo sub: Filling up stream2 >(pipe1.4)< by copying all timesteps.
cdo(1) daymean: Processed 30055088448 values from 1 variable over 67121 timesteps.