Error entering thread (1 Viewer)

[shaon0]

I've attempted to go into the following:
http://community.boredofstudies.org/13/mathematics-extension-1/210894/integration.html#post4350490
but when i do. I error message pops up saying that the operation has been aborted.
Does anyone know the cause of this?

Thanks

 

[electrolysis]

its working perfectly fine for me...