An exception of type 'System.ArgumentException' occurred in Microsoft.EntityFrameworkCore.dll but was not handled in user code

Error Occured in _context.userAccount.ToList()

An exception of type 'System.ArgumentException' occurred in Microsoft.EntityFrameworkCore.dll but was not handled in user code

Additional information: Format of the initialization string does not conform to specification starting at index 48.

OurDbContext.cs

public class OurDbContext : DbContext
    {
        public OurDbContext(DbContextOptions<OurDbContext> options) : base(options)
        {
        }
        public DbSet<UserAccount> userAccount { get; set; }
    }

HomeController.cs

private OurDbContext _context;
public HomeController(OurDbContext context)
{
     _context = context;
}

public IActionResult Index()
{
     return View(_context.userAccount.ToList());
}