This is the 293rd most frequent Polish word.
systemu
The Polish word "systemu" means "of the system" in English, indicating possession or relation.
In this sentence, 'systemu' is the genitive case form of 'system' in Polish, used to indicate possession or relation.
Modyfikacja systemu zajęła kilka godzin.
Modifying the system took several hours.
Here, 'systemu' appears in the genitive case to follow the preposition 'bez', which requires the genitive.
Bez systemu komputerowego, praca byłaby znacznie trudniejsza.
Without the computer system, work would be much harder.
In this context, 'systemu' is used in the genitive case to describe an attribute of 'errors in the operation'.