automation - Unable to scroll the page -

below both cods not work me

enter code here

javascriptexecutor js = (javascriptexecutor) driver;             hashmap<string, string> scrollobject = new hashmap<string, string>();             scrollobject.put("direction", "down");             js.executescript("mobile: scroll", scrollobject);  or  javascriptexecutor js = (javascriptexecutor) driver;          hashmap<string, double> scrollobject = new hashmap<string, double>();          scrollobject.put("startx", 200.00);          scrollobject.put("starty", 200.00);          scrollobject.put("endx", 200.00);          scrollobject.put("endy", 300.00);          js.executescript("mobile: scroll", scrollobject); 

error occure- error running appium command: string not function command duration or timeout: 13 milliseconds