I am a newbie programmer and am tinkering with your ''Delta-hedged straddle" code / strategy.

1)   I was able to change the starting date and run a simulation that stated in Jan 2010. But no matter when I start a simulation, it stops during 2017...even if I set the date to later than that.

2)  Also, can I run that same code on a different symbol? (like an Oil ETF for example? When I put in 'USO' for the symbol on Line 31, the code would not run...it says 'Runtime Error".)