Bugs in technical Paper Example Notebooks

I checked the Example Notebooks, and found some bugs:

- [ ] 1.The main problem is still the issue with generating forcing using ESMValTool ([see this issue](https://github.com/eWaterCycle/ewatercycle/issues/355#issue-1758152433)). There seems to be something wrong with the temperature data. This is the log that I get from example NB1:

ERROR [3482181] Failed to run preprocessor function 'save' on the data
[]
loaded from original input file(s)
[LocalFile('/mnt/data/climate-data/obs6/Tier3/ERA5/OBS6_ERA5_reanaly_1_day_tas_1990-1990.nc'),
LocalFile('/mnt/data/climate-data/obs6/Tier3/ERA5/OBS6_ERA5_reanaly_1_day_tas_19900101-19901231.nc'),
LocalFile('/mnt/data/climate-data/obs6/Tier3/ERA5/OBS6_ERA5_reanaly_1_day_tas_1991-1991.nc'),
LocalFile('/mnt/data/climate-data/obs6/Tier3/ERA5/OBS6_ERA5_reanaly_1_day_tas_1992-1992.nc')]
(and 26 further file(s) not shown here; refer to the debug log for a full list)
with function argument(s)
compress = False,
filename = PosixPath('/home/vhoogeland/technicalPaperExampleNotebooks/esmvaltool_output/recipe_marrmot_20230728_122744/preproc/diagnostic_daily/tas/OBS6_ERA5_reanaly_1_day_tas_1990-2018.nc')
ERROR [3477466] No such comm target registered: jupyter.widget.control
WARNING [3477466] No such comm: fc0ceb52-d861-433e-9279-70a996fbfd43

- [ ] 2. When I run this in NB2:

cfg_file, cfg_dir = model.setup(end_time=experiment_end_date)

And this in NB3:

observations_df, metadata = ewatercycle.observation.grdc.get_grdc_data(
station_id,
start_time=experiment_start_date,
end_time=experiment_end_date,
)

I get an [Errno 5] Input/output error. (Is this related to the disk space?)
- [ ] 3. In NB4, when I run this:

reference = ewatercycle.models.PCRGlobWB(version="setters", parameter_set=experiment_parameterset)

I get the following error: NoSectionError: No section: 'globalOptions'.