The
No module named matrix error means the save was made with a different version of the Ren'Py engine than what you're running. Sometimes happens when compressors build with a different version of Ren'Py versus the official game for example.
Previously mentioned in this thread
More detailed description of error
In that love choice menu need CDate >= 2 for Jolina to be offered as first choice.
CDate = -5 in Maviarab's save.
This menu lacks an option not to choose anyone. As doesn't meet the requirements for any girls, can't exit this menu.
The Jolina (157) and JolinaL (100) values are also much lower than mine at this point (var dump from saveeditonline attached).
No idea how CDate got to -5 when
Maviarab was exclusively pursuing Jolina though, as any of the normal game play choices causing -CDate are obviously bad choices.