I'm getting almost the same error.
10:17:19 PM: [WARN] This script threw an error, contact the script writer.
10:17:19 PM: [ERROR] Exception has occurred while running! Please report error to developer if problem persists:
java.lang.NullPointerException
at org.dreambot.api.methods.widget.Widgets.0(Widgets.java:302)
at org.dreambot.api.methods.widget.Widgets.0(Widgets.java:27)
at org.dreambot.api.methods.widget.Widgets.getWidget(Widgets.java:85)
at org.dreambot.api.methods.widget.Widgets.getWidgetChild(Widgets.java:160)
at org.dreambot.api.methods.container.impl.bank.Bank.isOpen(Bank.java:232)
at A.d(A.java:24)
at ak.onLoop(ak.java:220)
at aV.onLoop(aV.java:106)
at org.dreambot.api.script.AbstractScript.run(AbstractScript.java:234)
at java.lang.Thread.run(Thread.java:750)