Setup proper Error handling

[gromdimon]

Is your feature request related to a problem? Please describe.
Currently the script has multiple places, where various errors can occure. However, we need to have clearly specified error handling behaviour.

Describe the solution you'd like
Go thorugh all methods and a) find places where built-in errors can occure b) find places where custom errors can occure.
Then we need to implement proper error handling with logging just on the highest stage (in CLI app)

Describe alternatives you've considered
N/A

Additional context
Probably we need to create more custom errors and re-raise built-in ones in the building blocks.