Thank you again! Can see progress, but there is a different error message now.
Changed the script to:

Code:
function run()
{
	set(PLOTNOW|TICKS);  // generate and use optimized parameters
	History=".t1";
	BarPeriod = 1./60;	// 1 second bars
	LookBack = 500;
	StartDate =20180201;
	EndDate =StartDate+4; 	// fixed simulation period
	
	if(is(INITRUN)) {
		assetList("History\AssetsTest.csv"); // load asset list
	}
	asset(Assets[0]);

		
// calculate the buy/sell signal
	vars Price = series(price());


// plot signals and thresholds
	plot("plot",Price,NEW,BLUE);
	PlotWidth = 600;
	PlotHeight1 = 300;
	set(PLOTNOW);
}

And zorro gives the error:



That date error is confusing, since I did not select december at all...?