CEA_Load Curve

[Robertasgroi97]

Hi, i'm Roberta Sgroi, and i'm just starting to use CEA. I have some questions about this software.
1_What is the exactly mean of "Load Curve for District"? it is possible to have the result in kWh?
2_I started with a little simulation of a simple house (residential) and everything it's ok, the software generate everything. But when i try to do the "Photovoltaic Potential for District " it can't show the graphics, and appear something like this:
### " File "C:\Users\PC\Documents\CityEnergyAnalyst\Dependencies\Python\lib\site-packages\pandas\util_decorators.py", line 331, in wrapper
return func(*args, **kwargs)
File "C:\Users\PC\Documents\CityEnergyAnalyst\Dependencies\Python\lib\site-packages\pandas\core\frame.py", line 6001, in set_index
raise KeyError(f"None of {missing} are in the columns")
KeyError: "None of ['Date'] are in the columns"
Why?
3_When i try to generate the "PVT Electricity/Thermal Potential for District " i can see only the results for each month and not for a specific hour, is it possible to see the result for hour or only by the Excel file that i have from the outputs?

Thank you.