PG408

Results 2 issues of PG408

run code below , get the error "ValueError: 'x0' must only have one dimension." ``` python # Fit synthetic control sc = Synth(data, "gdp", "country", "year", 1990, "West Germany", n_optim=100)...

![image](https://github.com/user-attachments/assets/9f579f52-adde-4c77-b00e-cb3cab5f5fd0)