I encounter an error when I debug a Slider component within Opera 9.21.

The JavaScript library: jQuery 1.2.6 and jQuery UI 1.5.2.

The error message in Opera 9.21 is

JavaScript - file://localhost/D:/Source/Java/Project-Template/WebApplication/jquery/slider-basic.html

Event thread: mousemove

Error:

name: TypeError

message: Statement on line 4001: Could not convert undefined or null to object

Backtrace:

Line 4001 of linked script file://localhost/D:/Source/Java/Project-Template/WebApplication/script/common/jquery-ui-1.5.2.js

this.handleOffset = this.currentHandle.offset();

Line 3803 of linked script file://localhost/D:/Source/Java/Project-Template/WebApplication/script/common/jquery-ui-1.5.2.js

return self.start.call(self, e, this.element[0]);

Line 246 of linked script file://localhost/D:/Source/Java/Project-Template/WebApplication/script/common/jquery-ui-1.5.2.js

this._mouseStarted = this.mouseStart(this._mouseDownEvent, e) !== false;

Line 221 of linked script file://localhost/D:/Source/Java/Project-Template/WebApplication/script/common/jquery-ui-1.5.2.js

return self.mouseMove(e);

Line 2076 of linked script file://localhost/D:/Source/Java/Project-Template/WebApplication/script/common/jquery-1.2.6.js

ret = handler.apply(this, arguments);

Line 1858 of linked script file://localhost/D:/Source/Java/Project-Template/WebApplication/script/common/jquery-1.2.6.js

return jQuery.event.handle.apply(arguments.callee.elem, arguments);

At unknown location

[statement source code not available]

My source code is attached.

I am not sure whether .