assembly analysis error code 144

[MatthewTM]

I got error 144. I have found on some site through google keywords:
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""""Dear Friends,

I have written a UEL for Strain Gradient Plasticity and is working well when i give Boundary condition as Concentrated force, But when i apply displacement boundary condition the it leads to 'system error 144'.

Iknow that system error 144 corresponds to division by zero or infinity, but then why it is coming in on displacement boundary condition is i am worried about.

I will be extremely helpful to anybody for any type of help on above problem.

Thanking you in advance""""
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I just want this to work:

http://www.shrani.si/f/g/g7/4JrRj9F5/untitled.png

here is the file. Please can someone help? thx.

http://www.megaupload.com/?d=U26TZI89